Happy to have played such a . . . serious game :)
There are some seriously challenging platforming puzzles but they are fairly satisfying to complete. I think my only feedback is that it's a bit odd that you go back to the main menu instead of the level select screen, but that's just a small thing. The shooting and player trails effects look nice, and block types are pretty readable, even if the level layouts don't always make it obvious which way to go (which encourages exploration and finding secrets I suppose).
I wasn't able to finish all the levels yet but if I have time I'll try and come back to them; what I did play so far was pretty fun though, nice job!