I LOVE THIS GAME!! I love the 8 bit style and how there's little to no shading on things. The gameplay is also very simplistic but it's very fun to just upgrade your max bullets and ammo and go to town. I also like how the skill point menu pops up with slowing the music and pitching it down.
The 1 problem I ran into was how laggy it got with a ton of enemies and bullets (Which is expected, but just some small optimizations would help), particles might be mostly causing this, but I could be wrong.