Sorry for the year and a half delay on this, I got sort of distracted (and lazy). Vomitoreum should no longer launch other games (like Doom, Doom II, Heretic, Hexen, etc. etc.) when opening the game.

Thought I'd do this during a lull period, if you manage to see this before updating you may want to back up your current build to finish your playthrough, since updating GZDoom games wipes save data.

Hope this helps, again, sorry it took so long!