Nice game, but too short!
Damage from enemies is too low, there are also too many ammo drops. Weapons are nice, but there isn't an important difference in damage, speed, accuracy: everyone kill easily most of the enemies. The screen is too small and it's easy to click outside, so you should also implement a pause screen when accidentally click outside the game.
So it is a 3/5 for me: it's funny, but you need to improve it.
Tips:
- experience and levels up (with limited point to spend in accuracy, speed, magnetic, etc.)
- less ammo drops, so the users should use/upgrade all the weapons
- no end, maybe survival mode
Very nice and funny game, good for a little break! But it's too easy to unlock everything, thanks to medals' rewards: after the last level I had everything and so "why play again?", maybe if there was a endurance/survival level... ;)