Steering through the levels feels very smooth! Selecting the ammo feels natural and intuitive. Love the idea of the shield absorbing ammo that gives you ammo back. Cool that you also built very distinct different types of enemies to deal with. I noticed a scratched feature seems to have made it into the final build? At least it was not explained in the tutorial, but when you press R, the player turns yellow for 1-2 seconds and a sound is played. What's that about?
Overall nice game though!