What ended your playthrough was a glitch, not too sure what causes it since I haven't been able to reliably replicate it. Thanks for the critique!
No worries! Out of curiosity, what would you have to do to progress past the "test" screen? I tried pressing different keys but they didn't work. Maybe playing in a browser affects it?
Unfortunately I think it softlocks the game, if you reset it shouldn't happen again (hopefully)