Amazing job on this game, I'm really enjoying myself! I believe I may have found a bug. If I launch a grenade in this location (MAP06 The Mines) the game crashes like clockwork. I'm running on Linux Mint if that helps.
Edit1: just beat the game. It was a blast!
Edit2: Not a bug in the game. It was the version of GZDoom I was using. Don't use the flatpak version in Linux Mint's Software Manager. Use the deb version available on ZDoom's official website.