The gimmick is nice, it's cool that you can stack effects, and it could get chaotic pretty fast with some other different effects.
I think the crystals look nice too!
I noticed the ground doesn't visually match the actual ground on the borders, and you can just walk off of it, so maybe enlarge the sprite?
The window for the game is not showing the whole game for me and cutting the remaining time bar. I think this is itch.io's fault, it happened to my project as well. I just made the screen bigger until it fit the game entirely.