Hello there! I played your game for 4 levels or so. There are some issues I see in the game, I want to give you some feedback! First of all, if I'm not mistaken, there is no coyote time or jump buffering in the game, but those are like platformer 101. Having those will really help your game. Second, it's easy to die in this game but it doesn't start fast enough again. It should start instantly. Another thing is that when I press <ESC> I thought I would see a pause menu but instead the game closed. Finally, the game definitely needs a soundtrack!
I hope the feedback helps! If you don't understand my reasons for the feedback, feel free to ask. I will do my best to explain them further.