When I was trying to get the hard badge, i run through a bifurcation. Afer that, I think I glicthed the game, because the same straight bit followed by a dark passage repeated constantly. I got the Hard badge in an easy way. Please, fix this.
I somehow got the bage before completing level 18, but I completed the game anyways. Really fun, without hard punishment, a nice background music, and it involucrates thinking hardly. You often don't need to reset (except on level 16 i guess) which it's just cooler. One thing that you should implement is that when you're a drawing you don't have to spam the arrows for moving. Otherwise, the game is perfect.
4.5/5
For getting the aeiou medal get into the vent section in the Ghost Inmate ending (after the elevator section), select the plunger boots and after you fail, spam click on the aeiou.