I can't find the source code

I can't load app details in Aurora Store, so I can't install from there. I remember reading that That Level Again is free (and it used the formulation "distributed as Free Software", so it's clear that that's what they meant), so I figured that I could find its source code and compile it locally, but I can't find it

UPD: I guess I misread it, but my day is ruined and my disappointment is immeasurable​