Very good gameplay fundamentals, and most of the balancing is pretty good too, decent idea splitting the game up into levels, otherwise progression would feel so slow if you had to start over from level 1 every time. I do dislike that the shotgun ships AI just runs them into you instead of just blasting you from close range because thematically it doesnt feel right to me that spaceships would do that, but that's just my opinion. I also feel like the shotgun wide spread and long travel distance kind of invalidates aiming and promotes spamming in one direction. But don't let my vague critiques dissuade you, I really enjoyed the game!