So I thought this deserved a little more attention.
It's not GPL as was stated. I don't know where that idea came from.
https://gitlab.com/vn971/cevo/blob/experimental/LICENSE.txt
This is the first game posted here (I think) under "public domain" which isn't technically libre but does lie on our side of the fence. I honestly don't know enough about public domain law so if anyone wants to chime in, please do.
It's also the first compliant? game which is windows only, which sucks. I don't see any mention of porting efforts but there are efforts made for wine compatibility.
http://www.c-evo.org/bb/viewtopic.php?f=4&t=119
Also, what language is this written in? I have seen mentions of C#, in which case couldn't we get it running under mono fairly easily? Flights of fancy perhaps.
What do you think?