Getting over it and Jump king! Nice game you've made there! Loved it! I will confess and say I am sucker with these games but are never a good player of such, so the checkpoint system is a very nice addition to the game. Not sure if the game is build with this in mind or not, but the game still feels very difficult to complete (especially the last bit where you get back to the wizard).
I like every bit of the game, but for a bit of critique I'd say the controls needs a bit tuning, where I let go of left/right a bit early, and thus make the sword jump upwards instead. It doesn't harm the game in anyway, but such minor thing frustrates the player in a bad way. The game is hard enough already! Also, some background music / ambience would also be nice, just to make the game not so empty at times.
Anyway, you did a really good job! Congrats!