Interesting concept, but the collision detection is glitchy as hell. I refused to play past level 5, as I would frequently fly directly through a disappearing block before it even had time to start disappearing.
Try the new version 1.1 release. I've worked hard to eliminate the collision glitches.
Fun concept, but music gets tedious after a little while, needs more variety in that department.
Also there's a problem sometimes with collision detection, I ran into a few cases where there seemed to be an invisible wall blocking my way, usually I got around that by moving back a few steps then going back through the obstruction spot, I don't think it was by design, just a problem with collision detection that needs tweaked.
Playability and handling needs work.
Idea of reversed gravity is nice.
Character seem to get stuck on something while walking on plain rock, jumping helps, so it's collision detection problem probably.
Walking/running and stopping should have a slow start and stop.
Also a (un)zoom would be nice.
Final thoughts, too rouch to play. Please put hours in to those and I'll be ready for ... masses?
It's an issue with the Box2D engine that Stencyl uses, apparently. I've put in the effort to try and fix it, but replacing the collision bodies with tiles (ones created at runtime, anyway) just made the snagging problem worse.