Love the retro feel of the game, would've liked to see support for alternate controls as this game could make for a great one hand game with wasd controls, also an auto-fire would've been nice too, my finger hurts from pressing space too much.
As for the games enemies, sometimes they travelled faster up the screen than my lasers did so i could never hit retreating enemies, good variety of enemies however, would've liked to see some noticeable scaling as time progresses too