Good, but needs some fine-tuning
The recurring problem I have with this game is with the jumping mechanics. I'll constantly find myself falling into acidic lakes of death because I wasn't sure when my character could jump off a ledge. The other thing that irked me was the inconsistency of the checkpoints. If you had some sort of manual saving system, so that players aren't constantly forced to backtrack in the event of their death, you would save yourself a lot of aggravation from reviewers. I hope this helps, and if I find anymore problems with the game, I'll let you know.