Super cool!
Found a bug: I've encountered invisible walls in level 3 and also got stuck there (as in, my character does not move any more) : (
anyway; keep up the great work!
It did screw my run, and I didn't know about the "R", but you can go to any level at any time so not a big deal (also, space for the pause? this is weird :))
As of the feeling - I get a bunch of those every now and then, so maybe not as enthusiastic like the first time, but it does bring a smile on my face every single time! thank you!