Neat! I think there's a lot of unexplored space in non-rectangular grids for roguelikes. HyperRogue is a pretty cool exploration of that space:

HyperRogue is a turn-based game in which the player controls one character exploring a world based on hyperbolic geometry, with cells arranged as a truncated order-7 triangular tiling by default (with a few exceptions). The player can also choose to play on some other tilings and honeycombs in two and three dimensions, in all eight Thurston geometries, along with a variety of quotient spaces. It borrows procedural generation and permadeath from the roguelike genre, and puzzle-based combat of Deadly Rooms of Death.