This game contains mods published under different licenses.

Look into each mod directory to see its license.
I created a list of all of the mods licenses, but please keep in mind that it may be slightly outdated. I would highly recommend you looking in each mod directory if you want to redistribute this game or some of the mods included in it.
List of mods and their licenses:

cottages: GPLv3
food: MIT, CC BY 4.0 International
grenades: MIT License, CC BY 4.0 International
healing: MIT License, CC BY 4.0 International
main: MIT License, CC BY 4.0 International
mobs: MIT License
sprint: MIT License, CC BY 4.0 International (relicensed under MIT License by migdyn, the mod was released into the public domain by the original author, GunshipPenguin)
thirsty: LGPLv2.1, CC BY-SA 4.0 International
zombies: MIT License, CC BY 3.0 International