I have only just found Minetest. I installed v0.4.10 from the Debian repositories on my Raspberry Pi, not expecting too much. That game was reasonably playable after I enabled the GL driver on the Pi; unfortunately it crashed with various memory related errors. I downloaded and compiled v0.4.14 - that was easy - I just followed the instructions on GitHub. It now plays without crashing.
I have had a good week playing the default game as single player. I built a little beach hut, then went on an epic wander down a long cave system, picking up lots of coal, iron, copper and gold. I even found a Nyan Cat!
The issue I do have is that there are lots of messages "active block modifiers took (too long)". These might be hiding other messages. I have considered taking out the message line and recompiling, but I wonder if there is a better solution. I only want a temporary fix to see what messages are being produced (without saving the output and searching that).