2 Bugs and a few suggestions.
- The Character with Slingshot has slightly misaligned shots. (Not in terms on inaccuracy, it's just off the target.)
- (Not sure if it's intentional) Level 3 and 4 Fences and Doors' textures feels backwards. (The Lvl3 has the Grid and Barbed wire fence but Lvl4 is just metal sheet.
- Better handling for the car?
- Faster firerate for the towers depending on level.
- More guns. Shotguns, Machineguns, SMG, Sniper, and/or Rocket/Grenade Launcher. Ofcourse these takes hard work to obtain. :)