The game is pretty good, everything is well put together, the only issue that I feel is that difficulty varies widly, from having collected 3 Powerups or only having 2 abilities to combat with 8 enemies at once and more enemies were keep appearing on top of that, up to having nothing to shoot for a while even though you have all the abilities and collected around 11 Powerups. You should rework the difficulty, like how many enemies are appearing, on how many powerups have appeared and healthpacks. And maybe you can add new type of enemies or bosses but overall great game, I had a fun experience with it.