This game has an interesting mechanic that spices up the typical 2D platformer experience. However, personally I feel that, considering the clear Celeste influence, this game has a little too much of Celeste map design without enough of Celeste's meticulous care for movement. The light/heavy/normal switch mechanic would be a lot better if there had been a little more playtesting, as the biggest issue I find is that combining light/heavy is pretty difficult to use consistently without bouncing all over the place, ground pounding on accident, or jumping up 50 feet in the air without much reason (to my eyes, as a new player). I think this is one of those cases where, for a dev, it makes perfect sense to play  and maybe to some degree is scaled well per area, but when considering the perspective of someone who's never touched the game before, serves to be quite difficult not only to get the hang of but to stay interested in when failing over and over. I think a simple fix that would solve some of the issue with the switching from light/heavy is putting the controls for weight on the left hand, given that X is already normal weight. That way, the player isn't spamming the arrows all at the same time in a desperate attempt to switch in time to get the right level jump.

The visuals are cute and simplistic, though I do wish there was a little more unity in color palette as the colors are a little bright and nonharmonious with each other. However, I do think the character design is cute and gets the point across quite well. The music also seems to be pretty good, though it's mixed to be incredibly loud and without a volume slider, I had to mute the tab. 

Generally, I like your idea and I think it would be a cool game to complete. But without either a rebinding option for keys, options for volume or whatnot, it isn't really viable for me to finish at this time. Still, I hope you had fun building it and are proud of what you made, because it is one of the cooler platformers submitted to this jam. <3 

Cool game, I actually  got hooked by it. Movement little not intuitive but possible to learn. 7/10