I was going to ask if it was only meant to be one level, but after checking here there are apparently more I didn't see. I like the transition effects and sprite work.
I'm not sure if this is intended, but I could deflect projectiles back at the first boss, but it only works half the time and it always detonated right after, making the deflection pointless. The typeface (Or font if that makes more sense to you) is a bit difficult to read at times as some letters look similar to each other. There's also more to the controls than what the tutorials explain.