Hey, you have a great start of a game here !
I would advise you to like into buffer input for platformers, and adding varying height for jumps, also adding more 'juice' to the game. And personnaly, I prefere to calculate the jump strenght based onn the gravity and the height you must reach, also, adding steps that we jump 5 in one jump is pretty useless and boring, you could only make steps that fits the minimum jump height, less is of no use I find.
I hope this feedback is constructive enough to help you building better games !
Thanks for the entry and would love to have your feedback about my game too !