I wish I could give you a better review, but the controls and mechanics kind of ruined a lot of the fun I could have had. It had a lot of interesting ideas for the wall jumping and platforming, but the control made it unenjoyable and frustrating to play. Breaker5 pretty much explains it all. Also, walking off the edge to get to a wall that's directly below me is annoying as well since some of the walls are very small (one to two blocks) and you can easily go too far over to the left or right and miss coming back. You could have had the down button, in the case, make the knight slide down the nearest wall connected to the platform you're on.
I should also note that on one of the last stages where you have to run from that vampire thing is very difficult (so far, I wasn't able to beat it) due to these controls and the controls being somewhat unresponsive during critical points of the gameplay in that level. (Also there are times when the knight is walking left or right and he'll continue to do so when I let go of the arrow keys, making him fall off ledges and getting him killed).
Still, I do like the idea and game itself despite the controls. DO NOT let this discourage you from making games. I wish I could make games half as good as this one.