I got to floor 27 on Summoner yesterday.

I died at the second boss twice, but got the hang of it the 3rd time.

I've died on floor 27 3 times now. The thing which gets me are the bird mobs which cast chirp.
No matter how far away you are, even in a different room, you will be put to sleep. It seems unavoidable.
After getting put to sleep, they kill my pet and then chase me. And they do a ton of damage.
Plus, running away from them comes with a lot of danger of traps and running into other mobs.

I might try again today.