The game is interestingly challenging though I have met with a roadblock.
On level four after the saw the final hurdle with the spikes does seem to be too much. After managing to get to the position between the spikes I am unable to progress. The spikes above the wall do end up killing the player upon them contacting the wall, as they seem to be a pixel or two wider than they should. And due to the spike below it I can't manage to delay touching the wall without contacting the spike due to deceleration during the jump.
I would recommend either decreasing the horizontal size of the spikes by a small amount or allowing the player to change their jump height depending on how long they press the jump button. Either way, this is fairly promising for a first game.