Congratulations on submitting! That itself is an accomplish, both in terms of skill and putting yourself and your work out there. I definitely dug the music. That being said, there's a lot that can be improved here.
First of all, controls aren't mentioned in game or even on your page. That should definitely be a priority in the future for you. Making the player hit a bunch of buttons to figure out what they can do isn't great. Also, if you're going to make environmental pieces such as art that you don't interact with, they should be colored distinctly enough that the player can intuitively tell. Immediately upon loading your game I went to the right expecting to be blocked by the pillar because it looks like the floor and walked right through it and plunged to my death lol.
I'd also give the player more health. 1 hit lives aren't very fun and don't give the player the time to figure out how to progress. There were also some collision issues where I died and fell through the level and never respawned.
I would definitely read all the feedback you get and think about it This is what helps us all get better. Once again, congrats on submitting!