I did know about some monsters staying on some maps. The mimic chests are actually supposed to stay though, you're supposed to be able to loot them after beating them.
I didn't know about the crypt wall, but I figured some walls would be walkable, since I didn't have enough time to go through every walkable and not walkable tile properly. I've already been working on making sure all walls are unwalkable with a plugin, but of course I can't update the game until the judging is over.
The left facing portraits were actually supposed to be on the right side, but doing that was way more complicated that having them as is even with the plugin I used, so I saved even considering doing that for when I had the game completely playable. I'll probably work on it after I get all the bugs fixed.
I'll go through your lists and work on everything you found when I have time.
Thanks for letting me know about everything you found!
And thank you for playing my game! :D
I hope you have a great day!