This game honestly surprised me. I've seen a lot of games where a main gimmick is that you can't see (I've made one too), and I'm honestly not usually a huge fan. However, I actually found myself enjoying this one. I really liked the one crystal where you had to dash onto two different bouncers (I think it was the teal colored one) especially. As for feedback, I do have a couple things:

1) The level design was a little off in some places. I like the metroidvania aspect of getting the dash first and everything, and I think the general map layout was good, but some of the individual puzzles were a little weird. The way up to the dash felt a little bit like a mess of platforms, and the last crystal I got (the one all the way to the left) had a puzzle that felt a little bit janky to me. It wasn't a huge deal, just something to keep in mind if you expand on this project (or for future projects).

2) It wasn't really explained anywhere that the dash mechanic actually lit anything up. I think maybe if you had a small area after the dash where the player was forced to use it to light up an elevator or something that could be a way to do it? I'm not entirely sure, I was fortunate enough to find out how that worked by accident so it wasn't too big of a deal for me but that could've been pretty frustrating if I never found that out. 

Overall, really good job though. The gameplay was fun and engaging, the art was honestly really well done and you guys actually explored the light mechanic in an interesting way (which isn't usually the case with these kinds of games). Really great job!