I believe I have finally tracked down and fixed this bug that you were experiencing. I have uploaded a new version (1.1.0) that hopefully addresses this. Feel free to download and sideload the new version, and let me know if you no longer have issues!
I had hopes to tackle Thy Dungeonman III as well, but it's a much more involved project that's a bit harder to translate to the PlayDate (due to the Good Graphics of it all). I might tackle it one day, but if I did, it would probably be as a standalone project!
Thank you for your interest. :)