Loved the episode of Adventure Time's Dungeon Train and thought it would make a great endless rogue shooter with tons of loot drops. Wanted to practice creating a tile set that would be able to change randomly from car to car. Here's a basic mockup. Altogether there is 1 corner, 1 door, 1 wall, and 10 floor pieces with a 16x16 grid as a base.
Heavily inspired by Minish Cap for the tile set, absolutely my favorite pixel art game. And the sprite is more reminiscent of Pokemon