Cool level design, has nice timings, so it's just hard enough to beat.
The game is pretty jittery on my PC, and I ended up going pretty far in lvl 2 and then falling through the floor between all the textures underneath the map :$
I Don't know why the jittering happens, I have pretty up to date specs which should be able to run it fine, but it still happens occasionally. I found that restarting my pc fixed it, I still don't know the cause.