We all know mounts are the real heroes anyway, right? Nice job, great art! Would be nice if it was mentioned in the game that the double jump only works without the knight. I had to look at the game page to figure it out.
There's a solid base to work from here, so if you plan on making updates, I'd like to suggest making the horse respawn without the knight if the knight wasn't on his back at death. Constantly having to re-dump the knight breaks the flow of the game. Still a game to be proud of!