Hi, glad You liked it. You can press ESC to exit (yes, we should explain that in game, sorry)
Viewing post in Connecting Simulator A jam comments
Hmmm... well You could've found a bug;) But the keys are crappy in this game currently. If You see a test box You have to press SPACE to close it, to exit screens You have to press ESC most of the time. So after solving puzzle: SPACE then ESC. Sorry:P
If its not this, and You want/have time You can write exact steps, because its probably a bug if this doesn't work.