Fun
I will say though... The game could be more expansive. The graphics are nice, but obnoxiously simple, especially the sticks. I like how you tried to add customization with the heads, but it didn't cut it. The animation had nice proportions but weren't very smooth. However, I will say the menu screens, buttons, and overlay were simple and easy to maneuver, and there were a lot of little things that made a big difference.
The audio was good and I especially liked the sound effects, but a few songs were repetitive. It would have been nice if there was a default song for a level, but it was interchangeable with other songs from the game, etc. I do like the expansive selection of music, though.
The gameplay was fun, but lacked a few things. It would have been nice if the shortcuts were shorter, such as using ASDF instead of 1, 2, 3, and 4 for weapons and such. Another thing is that if you have 1 player against 6 players, the 6 players are much more vulnerable because after one player moves, he can't move for another 5 turns and can be killed easily. Some point system allowing you to choose to a degree which player you moved might have been nice. Also, the computer AI was buggy. Some enemies shot each other, or threw grenades straight down, or shot straight into the ground. I also would have liked if the game was fully navigational using the mouse.
As for the levels, they were fun. Campaign was pretty easy, although multiplayer mode would be cool. The level designs were different and fun, and the Custom Battle button was a very nice addition. It took me some time getting gold in all of the challenges (although you can hold down the spacebar for rapid fire with the rifle), but there was no problem: No rewards. The customizable hats would have been nice, or maybe a super challenge mode where you didn't have to create your own challenge. The hardest battle I ever beat was 1 vs. 6 on the Graveyard, which I won by standing on a tombstone while the enemies shot each other. Needs a bit of work, and maybe an option for more players... Like taking on up to 10 people at once.