Hah yeah you could have used it to cheese achievements. I made it a bit tougher but still left it in for that exact reason - let power users do their thing. I was going to eventually make it more accessible and remove achievement tracking when using it in a run, but I've done other things instead haha.
This was a test to see if dungeons that need to scroll could work - my main issue is that there isn't enough items to allow for more than 4 shops before you feasibly have most of them by the end of a continuous run. I could add steps in-between, dragon = 17->20->25->30->40->50, etc, but I think I would need a lot more items so the shop doesn't become all potions :)
Also, I think with increased size there is more room to play with the layout (making more "corners") and potentially group spawns like the Gorgon. Right now I'm thinking of a Snake Charmer + Snakes that spawn in a diagonal. Thematically sounds neat, mechanically the placement is new, but it means more beast which will make Meat Grinder even better lol