Fun game! I have a few complaints though: the ledges you need to double jump to are too unforgiving. I'm certain I'm jumping at the top of my jump, but it still takes me several tries to get up. I thought I was lost in the tutorial because of that! I managed to get out eventually, but it's just irritating. Stairs are wonky, but you probably already know that. And finally I didn't like that one hit sent you back to the start of the level. Coupled with the jumping problems I had earlier, it just became too tedious to continue.
But despite all this, still enjoyed it. The graphics are decent and the controls for the most part are fine. The level design is solid and easy to navigate. Honestly a very solid game. Nice work!