Ok bro, you either love precision platformers and think the game is easy, or you're aware that this game is difficult and take joy in torturing others. There is no reason it had to be this hard.
It is very fun nonetheless. Simple, movement-based mechanics are always a great idea for jams, and you have a great implementation here. It says a lot that I kept playing despite dying over and over. I got up to "3 checkpoints left"
Some critique is that I think the tutorials should specify that jumping stops your momentum. Also, since you die so often, respawning should probably be automatic instead of waiting for me to press space. Unless the player is spawning on a moving platform or under ice spikes later on, I don't think this game benefits from adding that small respawn delay.