The visuals are nice, and I like the animation. The concept is fine, I didn't notice the light going off, so I guess I just went too quickly for that.
The game doesn't fit the limitation at all, which is important in my estimation. And aside from that, the feel of the movement, which is the most important part for a platformer, is not good. It feels too floaty and with little to no feedback, as well as bugy.
I would've put a lot more time into the movement, make it more impactful, with stronger gravity and a better jump. There's an amazing talk over at the GDC channel about using math for a better jump, and it lets you polish the jump by thinking of it in terms of height, distance and time instead of force and speed, while having gravity very present, that shift in perspective is valuable. Movement is one of the main points in a platformer game, and I personally would rather the game has a better feel but worse visuals than the other way around, though that is personal preference.
Other than that, I think more feedback would've been beneficial, like bouncing off enemies to give a better feel on the stomping. Overall, really good project, it shows a lot of potential.