Impressive! Very happy to hear that you've enjoyed it a lot! :D I'll release a post-jam version with some fixes and tweaks, so I'd advise you to wait for that if you want to jump in again.
Judging from your monster descriptions, I think you've seen most of them. Maybe there's one or two more that you're missing as they show up past level 7. But I'm happy to see that you like the variety :D wallbro is my favourite as well.
Yeah you always play the same dungeon. You can configure the seed in the advanced settings, but due to a sleepdeprivation bug, the RNG always uses the default seed when generating dungeons, so it's always the same. I intended for everyone to have the same experience unless they change the seed, but alas there's currently no way to play different dungeons until I fix it in the post-jam version. You are correct that all you need to do is find a lever to open one of the two exit doors. There generally are two corridors leading to the exit room, and most rooms have two or three connections to other rooms, so there are multiple ways to complete a dungeon level.
Agreed about UI, I hate working on it and this time I reused it from last year's jam because I had other priorities :D
Thanks for playing!