Board Game Arena adaptation of a card game named ZeroDown (or Zero, or CatAssTrophy)
See ZeroDown on BoardGameGeek to see who designed/published the original card game.
What is contained in the second git commit (named feat: init project from BGA generated code) is licensed under LICENCE_BGA file (this is the source code generated by the Board Game Arena framework).
The rest is licensed under GPLv3, credits go to the git commits author. - See LICENSE.md file.