I wasn't able to play this game myself because my laptop fan decided on an early retirement. Which sucks, because this game looks genuinely fun and like the type of gameplay I'd enjoy. Instead, I made my friend (who isn't good at games) play this and laughed at his suffering -- he couldn't get past the first part. I can't give much feedback until I play the game myself (which I do plan on doing!), but I still wanted to give what feedback I can from watching my friend.
At the very beginning, after you go to sleep, it isn't clear that there are things behind you that you're supposed to interact with. It's also very far from the "start" point. My friend ran all the way to the start of the course just to realize he needed to go back and talk to the girl to get the grappling hook. Then he needed to run back.
I liked the ability to get little bonuses each time you lose to make it a bit easier. I also like the overall theme of the game and how you used the concept of sleep myoclonus to base the gameplay/lose state around, as well as the title.
I'll add more feedback if I'm able to play the game myself ^^