Love the graphics and cool idea...
Some none game breaking things I'd just like to say for you're future projects, not that they made the game bad:
- The enemy bullets should delete themselves after a certain amount of time - maybe use a IEnumerator?
- Better indication of when the player is taking damage
- Should the bullets be able to hit each other? If not maybe check for a tag to see if it is a player on the trigger event (You probs already know this though :D - sorry XD)?
- When I died my gun stopped working on respawn, honestly no clue what caused this lol
- Maybe the gun pickups could be more identifiable, didn't really know what I was doing at first lol
Either way, awesome project!
(Oh and I always appreciate a mute button, just to through more stuff in there ;P )