It's too cluttered! I can't tell what is and isn't important, I keep trying to collect the jellyfish things and often can't read the text saying how many crystals I have left to find. I get stuck on walls, get hit by enemies with no warning, and there's insta-death spikes which I casually walked onto at first cuz I thought they were another background element. Giant plants and hands cover up the background, while the plungers(?) you fire are so small and indistinct you can lose track of them.
All of this makes it a bit frustrating to play. After dying with 18 out of 19 crystals two times on the same level (the giant maze level), I just plain gave up. The music is nice, but I wish there were more tracks, and the alien planet feels more like a scary halloween world than anything else.
All that said, the visuals are nice, and thank you for having save games. Once I'm less tired of dying so much, I can pick up right where I left off.