Sure, gameplay wise, I have a few suggestions. I think the starting shoot speed is a little too slow. I know the idea is to build speed with power ups, but I think the overall fun factor would be better shifting everything to the faster side. Second, for a top down shooter type game I think the player needs some more health. Rather than having a few enemies and a few points of heath, there should be a lot of enemies and a lot of health to give a better feel of action and danger. Lastly, (this one's minor) I think there would be a benefit to have a checkpoint after the tutorial rooms to not have to do it over after the player already understand the basics of the game.