Solid game, congratulations on your release. A lot of care and polish, many nice little touches. I liked the scope and the quality of the game. Very nice with the leaderboards too, although my time sucked (I'm not great at platformers).
I'm not sure if it's by design (no platform export), but I noticed that standing still next to a wall and double jumping will instead trigger a double jump even if no arrow key is pressed.
Once again, very good job!