PLEASE NOTE: This review is written for the 2021 Minetest Game Jam version of this game, by a PARTICIPANT. I used Minetest version 5.4.1 to playtest.
There is not much to do except hopping around to color the blocks. On the ContentDB I heard of dragons by replicating something in the screenshots but I was so completely unexcited by this idea I didn't even try. This is very essential information, should be all in-game. Since this is a GAME jam, not a SANDBOX jam, I have no choice but to give a thumbs down.
And even as a sandbox, I think it's boring since you literally have only 4 actions.
I highly appreciate the experimental nature of this very unusual game/sandbox concept, however. Experimenting with new concept is always great, so obviously some experiments end up in failure. Don't feel bad for this project, the thing is that you did something.