Great game! I loved the visuals. The music was great. I thought it was really funny that you're just fighting a bunch of birds!
I also really liked the system of having different slots for your weapons.
However, I think more could've been done to make the top and bottom slots useful, since at the moment they're just objectively worse than the side slots.
Also, it'd be nice if the upgrades were guaranteed to be different, since on my first run I was forced to choose between Rotators in 3 different spots for my first weapon.