Day 3, upscaled to a 16x16 tileset (gobbo is still 8x8). Gobbo is currently able to clear a 1-tile gap with a jump pretty easy, but doesn't have the vertical reach to jump up level to level, and that's how I want it.
Added and implemented ladders. This involved remapping "up" to mean climb and setting a dedicated jump button. Getting "jumping" and "climbing" to work together was maybe the trickiest part. Gravity effectively turns off when you're on a ladder tile. Added the climbing animation.
Next step is going to be implementing the antagonists; I think they'll also be around 16x16, much bigger than gobbo and essentially just barely fitting in the tunnels. Still considering a shift from "climbing ladders" to "climbing walls and ceilings" but for now this is fine.