(End of) 2020 Update: Uh, it seems some time between now and when I wrote the text below, these games are working again? Scratch can be such a volatile platform :P Well, looks like Scratch 3.0 broke all my games that use this style of collision detection. Welp. Instructions onscreen. Try pressing Q for an "alternative" version of the music!
Hmm, I wonder what game this could be an engine test for?