The art was great, and the levels and everything worked nicely. The one critique that I have is the time between turns is a little slow when there's some levels that I regularly die on, so it takes a long time to redo them even if I know exactly what to do. It could also use some music. However - the death screen effect is awesome, the sound effects are great, and that one level that I saw you call 'the invisible spike' is an awesome idea, I'd just say maybe throw in a hint like a statue in the corner of each so that it implies the mirrored idea. Great game though, it was a good time!