the concept is nice nut the jump is very stiff and feels very heavy also there were a few bugs: the bottom half of the screen wouldn't render well (or at all) and scenes would load before they should wait there is more I could collect some coins more then once. but other then these issues the game was great! with some more work it would be really fun! but you aren't there yet.
also I played the browser version if you want to recreate the bugs.