Deer and tombstone is a really fun combo to get. And the rat king change does sound like it made it a lot more viable.
I'd love to see even more done with the game if that ends up being a direction you wanna take it and enjoy working on it. I haven't ever played Dorfromantik, but I love Slay the Spire and it also has a similar vibe to Backpack Hero. Maybe if all three had a very weird baby lol. Either way, I've been having a ton of fun and definitely gives that Spire dopamine I can see myself coming back to get again and again.