Good first game. The movement could use refinement. the blue blocks could fire less, taking them out required getting up close and really hammering them since the bullets canceled each other out. There needs to be some feedback on a successful hit, a flash, a knockback, a shake, a fading damage counter, something. The music is high energy and adds an immediacy to the game that it would be poorer without. With some art and refinement you could really ahve something here.