Hi, first of all thank you for this game. I love it!
Now to the bug I found: In Monika's "space room" scene, there's a part where she addresses the player by their OS's username instead of the name chosen for the game character - this only happens on Windows.
I have decompiled the game files using unrpa and unrpyc and this should be easily fixed by reducing the indentation of the try/except block in splash.rpy lines 211-217. :)