Very cool game :D! Nice graphics, music and sound effects :)! Great feedback too :D!
Some points/ideas:
- There's not much to shoot. It would be more interesting if the turret he spawns stayed in the arena until you shot it.
- The game should get progressively harder.
- When the enemy is not in motion, you can just click on him, which is less exciting.
- The ball would actually be very interesting in the combat (just saying)! The rotating effect is awesome :D!
Really liked it :D! Good luck with this game and with future projects :D!