Needs update for 2021. No longer launches.
Update for Mac-version! (v1.0.2)
I just uploaded a new version for Mac-users (v1.0.2). It has a (dirty) fix for a problem with the resolution setting in the settings menu that caused the resolution to be resetted each time a level was loaded.
You will notice the default Unity resolution menu popping up when you start the game. Set your resolution there and it hopefully stays the same for the rest of the game. Unfortunately I can't test this thoroughly, so if you happen to run into problems, please report back here!
The windows version remains unchanged as the problem wasn't reported for that platform (and didn't occur for me).