This "game" includes a lot of tools that exercise all kinds of Minetest features. Very useful during mod development to test how your mod interacts with various types of nodes, items, entities...
Every item has a purpose, there are no decorative nodes (in fact the textures are quite ugly). There is one grass, one wood, one stone... on the other hand there are many variations of item/nodes with different properties, such as liquids with many different ranges and viscosities that you won't find in a regular game.
As others already wrote, this is not for playing. Well, except if you enjoy messing with the engine.
I love the ambience you built! The intro sequence was really good (maybe even a first among minetest games?), the helpers are super cute (even though it's a parkour game I wish there were more optional interactions!), and the maps play well.
Good choice of soundtrack too.
In general the game looks very polished for a game jam entry, congrats!
The controls surprised me at times (long slide, unexpected momentum when jumping off, abilities not working at the edge of blocks), but I quickly got used to them.
Maybe I’m supposed to play in third person? That would explain the slide distance.