July 28, 2009
Critter Defense is one of the cutest tower defense games available in the App Store. Despite its appearance, this game has a lot of fun to offer tactically for those seasoned with tower defense games while being simple enough for more casual players to really enjoy.
In this game, your base is assaulted by colorful crawling bugs in one of three areas: Grasslands, Seashore, and Metropolis
You start the game in Grasslands while Seashore and Metropolis must be unlocked. Within each area there are three levels and then a Boss Fight making a total of twelve maps in the game. Each map is fixed path, and the paths themselves are pretty short; however, in Metropolis, critters will enter the map from multiple points making this area more challenging. I would love it if each map was longer and you had to pan or pinch to zoom in/out to see all of it.

One of the tactical twists this game offers is that not only must maps be unlocked, but your towers as well. Each level must be won to unlock the next map and a victory in the 3rd level also unlocks your first new weapon, a poison tower. Your initial guns are a basic cannon tower, a dart tower which is effective against fliers, and an ice tower for slowing the critters.
This is where one of the game’s more interesting aspects comes into play. Eventually, you will have access to eight different tower types, but you will have to make a tactical choice. You can only select three of the available towers to bring into a map. This makes for some hard decisions, but also allows for experimentation by combining different tower options. Once you have a tower unlocked, you can use it in any previously unlocked map.

Gameplay
Critter Defense includes a short tutorial showing you how to play and how to interpret the information on the screen. It is simple and effective.
Your base will be assaulted by various really cute little bugs. You can see the next wave coming at the upper left. Flying bugs are really fast…so fast that your basic cannon tower can actually miss when shooting at them. Each bug’s health is denoted by the stripe in the center of its back which is a very clever way of showing their status without cluttering the screen with a bunch of small red or green bars.
There is quite a variety of bugs, so many that I wish the developers had included a Field Guide to Critters. Some are slow but can take lots of damage, others are fairly weak, there are flying bugs, health regenerating bugs, and in Metropolis you will face bugs that can shoot at and destroy your towers.
If your base takes damage, it is shown by a black arc erasing the red ring. It definitely works for me, but I can see some people wanting exact numbers although that would detract from the simple, clean graphics.
There is no fast forward button, but you can choose to send waves in early. The maps are currently small enough that a lack of a fast forward button is not a detraction to me.
Tower Building
Tower building has its own twist as well. Each tower must be built where it can receive power so your initial towers must be built near pre-determined power stations shown as a white circle with a red lightning bolt. However, each tower you build also emits its own power, and this lets you start chaining towers away from the power station. Touch anywhere in an open area and all of the legal build areas are shown as white circles.

The tower building process is very easy. Your available buildable units are shown at the bottom. Simply touch a tower icon, it will highlight, and then drag up to a point on the terrain. Crosshair colors will tell you if you can or cannot build on a point.
White = okay to build
Black = tower will not activate…not close enough to a power source
Red = tower cannot be built on that spot
Because of the ‘drag to place’ tower building, precise tower placement can sometimes be fickle as you are trying to determine a tower’s location under your finger. Also, you must be careful to simply lift your finger and not move it sideways or you may alter the build location. This is where the inclusion of crosshairs is of immense help; they really help you pinpoint where a tower will be located before you have placed it.
To see a tower’s range, tap on it once it has been built and a gray circle will appear showing its range. I would really like it if the range was also shown before a tower was built just to make it easier to decide on placement.
As each gun fires, a black arc appears on the tower and when it becomes a circle you can then upgrade. Simply click on the upgradeable tower and a menu appears at the bottom. You can choose to increase damage, range, or rate of fire. Each tower can only hold five upgrades so choose wisely. Upgrades get progressively more expensive, as well.
Scoring
Your final score is affected by several factors:
-damage to your base or lack of it
-the more cash you have left, the better a score multiplier you get
-sending waves in early, risk = reward
You are also awarded medals:
Gold = win + no base damage
Silver = win + base damage
There are personal and global high scores for the game. Both are stored remotely so you must have Internet access to view them. The personal high score table shows your total accumulated score for all games played and then you can see your top five scores by map. Your medal earned and towers used are also shown. The global scores show the top five players for total points accumulated and top five scores for each individual map.
Overall
Pros:
-simple, cute, and clean graphics for the maps and bugs
-highly visual interface – bug damage, base damage, tower upgradeability, upgraded towers are all denoted visually
-interesting tactical twist – must build near fixed power stations initially and choose which three towers you want to use on a map
-global scores and detailed local high score table
-8 unlockable towers
-3 areas with 4 maps each for a total of 12 maps
-you can “lock-on” all guns to a specific critter and have them concentrate fire
-large variety of critters including those that shoot back
Cons:
-there is very cute, cheerful music playing during the main menu, but it doesn’t play during the game
-the black bullets the towers shoot are really not attractive, it would look so nice if each tower had a different graphic for shooting
-same for the sounds, the towers make sounds when they shoot, but they all seem to sound too similar
-no endurance/endless mode
-need to display the tower’s radius of fire as we are dragging it up to build so you can decide where to place it more effectively
This game is full of charm and has a very nice graphical interface; I would just love to see bigger maps requiring pinch to zoom or panning. Right now, it may not be the deepest tactically, but Critter Defense is still fun and can be challenging if you are going to go for gold medals. There is enough content and tactical potential here to satisfy tower defense veterans while offering a good learning curve for the casual player. There are a few areas that I think could use a little tweaking to add some polish, but as it stands, I think this is a great addition to the plethora of tower defense games on my iPhone.
Price – $2.99
Critter Defense in iTunes