FOSS gamedev and creative worlds

I read the mod-tutorial, and while at it, I wanted to make something simple but useful.

When starting to play, coal (for torches) is often a bottleneck,
so my mod "coolcoal" enables the player to make coal from wood:
1) to craft 1 coal from 3 wooden planks
2) to cook sticks to coal using the furnace.

If there is interest, I could pack it up and publish it here.

As it is almost straight from the tutorial, should I bother
to put it under some license (and if so, which one) ?

Yes, the license is important for all published work from you.
https://tldrlegal.com/ is a great site when you don't exactly know what a license allows or restricts for those who download your mod.
The most common licenses are CC0, WTFPL (which is almost identical to CC0), MIT and BSD 3-Clause.