Hiii, I've made a video about the game and wanted to give you some feedback about it, hopefuly it will be helpful for the development of the game or new ones that you make :D
-Visual style, main mechanic, the main concept around the character and everything around it it's quite awesome and I really loved it :D-Making more clear the function of breathing near the crystals could be great as I was confused about it at the beginning of the game and took me some time to figure it out.
-In general the game has a level of polish quite good, adding more context ingame for the history and some little tweeks here and there could end up in having a game very interesting that I would love to buy at Steam (for exemple) :D
Regards :)