Cool platformer, it is fun to rush around and try to collect these colored gemstones, but it's maybe a bitt hard, maybe a bit of rebalance on the timeloss when you get hit by enemies could help.
Anyway, other than the difficulty the game is pretty solid overall, the pixel art is really cool, especially some enemy designs like the "Angry blocks" and "Cyber orbs" (sorry about the silly names :p) and i also like the subtle colored light shader for every collectable stone that can help to find them quickly under the time pressure, which the music complements really well !
Overall i'd say well polished, just needs a bit of tweaking to balance difficulty levels, other than that well done :)