I ended up playing through the Windows build via virtualization. I encountered what I think is a bug in the Magirune 1 dungeon. I was playing on hardcore mode, and after I obtained the sword I started getting 1 experience for every enemy that the sword auto-killed, and it happened every time I entered a room. This meant that by moving back and forth between two rooms with a lot of enemies, I quickly leveled up and the endgame became completely free. Something got crossed and it forgot that I was in hardcore mode and shouldn't get the re-kill exp, I guess.
Since I'm here I'll also mention that I somehow got 21/20 first kills of Shadow 4, and in the Magirune 1 dungeon it shows 1/20 first kills of Flame which I'm pretty sure isn't accurate.
I also have something in my inventory that looks like a maybe a card? Rectangle that's orange on top and grey on the bottom, with some lines on it, and I have no idea what it is or at what point I obtained it. While playing I kept hoping that hovering the mouse over an inventory item would show a label in situations like that.
Anyway thank you for all your work! I enjoyed the game a lot.