Good for a first level. You really should put "demo" or "jam version" in the title, so people are not surprised when there is only one level to go along with your epic story. I also would suggest changing download options from the default of a $2 donation, to free for this jam version.
I like the art and character design, though Rogue would definitely would benefit from idle, walking and jumping animations to accompany his movements if you can draw/have access to more animations. Another option would be to "cheat" and give him a ground length cloak so that his idle, walking and jump animations could be the same -- that would probably be what I would do if I was drawing my own art :)