Hey! Assuming you're on Windows.. its:
C:\Users\[YOURNAME]\AppData\Local\Rainsdowne_Act_2\save.ini
Awesome, thanks!
But does that "Act 2" mean this game is actually the sequel to something?
It's a legacy thing, there was originally a shorter prologue version available (Act 1), and the full game was going o be Act 2, but the game changed so much over time that I retired part 1 and remade all it's content within a single full game.