That's a very nice mechanic! I like how fast rumba goes and the little enemies. The music is not loud I think, in some places it was quieter than others. There is an overwhelming amount of levels! :0 Speaking of which, I think it may be good to number them, so the player knows where to go. In addition, I think you could make more "action" levels, it feels really good for a quick rumba to go shoot enemies in a rage)
Thanks for playing, Nick! Glad you enjoyed it.
The levels are actually numbered, it's just hard to see the numbers on the sprites (the color of the number and the background blend together). Originally you were supposed to unlock levels as you went with branching paths (with two levels beaten you can either go to Lv. 3 or 4), but that didn't make it in this build. I'll re-add this feature and make the numbering clearer in an update :)