Kinda fun, but got a bit tedious by the time I stopped (level 8, nearly got through twice but fumbled the last input because it's kind of hard to tell when you'll be in the spot to do it) Wrist started getting sore and I still have games to play through so I didn't want to run myself down too much. (thankfully I'm not the main character of this game and can stop ^^;)
Controls were ok, it's inspired by Super Meat Boy but could apply some of the teachings from that like input buffering on the jump (especially on the maps that start you in the air for some reason) or at least more of it if there is a slight amount, and variable jump height which'd help a lot of jumps give more control to the player.
The instant reset is both a blessing and a curse, especially when it comes to the audio, because hearing the spike sound over and over is very grating on the ears. Could maybe do with a more subtle sound and/or a button tap to restart a room (though it might be a thematic choice to have it reset automatically.
The clinging up against a wall feels a bit counter to the premise of the game, maybe if you ran the other way when you hit it, or ran up the wall? Obviously doesn't work with the current level layout but perhaps if you return to this idea at some point.