I already had a feeling that it was inspired from celeste (great game btw), as it was very similar. It's just that, in celeste, it will take the player 15+ hours to get to the point of learning those combo's, and I don't expect you to make a game that long in a week. In your game, the player has to only finish a few levels. I'm not saying you should leave it out entirely, it's just that it is such an abrupt difficulty spike.
Nonetheless, you made a very enjoyable game!
P.S. Good luck with your finals! :)