The game is being built in Unity, and the developer created a custom voxel-running system on top of the game engine. Voxel art is used with shaders to make it look good in 2D.

For planar terrains: basic shape from 3 to 10 sides. Number of terraces. Terrain size and maximum height. Detail level (a.k.a. fragmentation depth). Sculpting features (hills and valleys): Base ...