This is super cool! The moons also immediately reminded me of Magic Survival, that game is very good. I like the art style and the music, it all fits together very well! The boss walloped me but I'll give it another shot. There's not really anything I disliked, but if you decide to update it, more upgrades and enemies are always welcome! I'm working on a pixel-y shooter game too, called Shmooblin Blaster, so if you'd like to check it out and leave some feedback I'd very much appreciate it! Nice game!