The music choice fits the game and its pace very well, not too hype if that makes sense, but calming and does its job as background music very well.
I think you should try improve this game by adding jump sfx so it is more engaging, and make use of more sfx to bring the game to life more (like maybe a quick 1 sec death sfx when falling in the lava, quiet movement/footsteps, etc). You did a good job when the character shoots those fiery projectiles, and the sound of it makes it sound like an energy blaster (the only thing I will say is maybe add a rotation to them, but they are great like that). On the other hand, the camera movement always remains on the character looks pretty smooth, the background is pretty nice, but it lacks movement to bring it into life (examples, maybe add a flying crow that appears every so often, make it look like the character is breathing, slight dust particles when jump/walking, or even something like a "glowing" moon may fix this, a falling star? idk, but obj tweens are great for movement/life ).
Easy to understand the controls, good music, and I can easily see a lot of improvements happening with a few minor changes. Keep it up!