I'v been brainstorming for a few days, and today I'll actually start working on my game. I'll be taking inspiration from Dungeon of Flowers by Ribbon Black.
I'm thinking something like a 3/4 perspective dungeon crawler themed around flowers in some way. What's gonna be the biggest challenge is the "1000 dungeons, 1 million monsters" bit. I might try to do something with procedural generation or random selection to achieve that. But we'll see!