I really like the style of the game here, and embedding the Sparknoids into the environment makes them fun to find and interact with. I think my biggest issue was the difficulty of triggering the puzzles. I had to give up after the (first?) coin one because I couldn't get the one in the next hallway to trigger.
I think it might also be more immersive if after you complete one of the puzzles, the wall environment updates, ex: if it goes into a pipe, it should disappear rather than reset to its spawn point - but that's just my thought!