The demo is much better than I had anticipated. I'll admit to having a bit of a negative bias towards media featuring fancharacters, but this is honestly a contender for one of the best games out this SAGE.
The graphics and music are both fresh and not blatantly ripped from other sources. (for the most part) Controls are solid, collision is fine, but the pacing in the level design seems a little off. I had a difficult time adjusting from the faster portions of the stage to the slower platforming sections. I'm not a big fan of the combat system either. Running up and smacking baddies really takes away from the momentum that drives some of the better 2D platforming games.
My criticisms and opinions aside, I wish you lots of luck in all of your future fangamery.