Took me a bit to figure out what exactly was causing the movement to be faster or slower. Made it to level 18! :D
Just to note - going into the tutorial screen (kind of more like a how to play screen), there was no way back out that I could find anywhere. I had to refresh the browser page (f5).
I did not really notice any difference in difficulty between levels. Is this an infinigenerator? Just curious.
Music was fun but got a little bit loud. Went really well with the glowy environment though ^_^ Overall fun, maybe could use some ramping up of difficulty (I only lost level 18 by a hair due to heading the wrong direction first XD) Great job! Cheers.