The character is cute and the music is okay, but I had a really hard time getting anywhere past the starting room. It feels like any jump requires you to back away because of how long it takes to actually jump (and how little air control you seem to have), and tiny steps that look like your character should climb them automatically feel like insurmountable obstacles. By trying to climb the platforms to the right instead of going left, I managed to jump outside the playable area and get trapped below the level. The reflections (or whatever's going on with the floor and wall textures) feel like they only draw attention to how basic the level design is, rather than making it look better.
Overall, an interesting demo but very rough around the edges.