I liked the concept of the game and the visuals look really good. I found that the controls need more polishing, it was hard to use the dash + jump in once you enter the tunnel.
I think the main thing you should work on to improve in your next jam is your attitude towards your own submission. Instead of clarifying the mechanics and presenting your concept you spent your page description saying your game sucks. It's a game jam, most games suck! Your game was playable and looked reasonably good, treat your submission with respect and other people will treat it as well when giving you feedback to help you improve.