Im going to add (and maybe remove) some things, but here is a list of ideas i have that you could add:
Gameplay/Physics
- Recoil Physics
- Naturally decaying bases (idk if already implementet)
- Many people are confused by the joystick. A tutorial could be helpful.
- Fast bullets have very weak collision detection.
Graphics
- Shooting animation for tank
Possible Tank Upgrades:
- Sniper: Shoots very fast bullets, but has a longer reload time. (Bullets could also live longer)
- Flamethrower: Shoots many bullets that are slow and dont live long.