Worms Armageddon is fun! This game has tons of customization (pic related is all custom terrains) and there's a lot of depth to the gameplay, yet it's still very playable as a casual party game. It goes on sale frequently on Steam, but it can also work online even if you pirate it. Here's a link, courtesy of 4/vm/:
https://drive.google.com/file/d/18dAXkqtQNjb_T5E5MSqXqZk0xzQdPdjY/
If there proves to be enough interest, I may use this thread to host games for 22chan, or maybe even a tournament.
If you want to play with custom terrains, you'll need the following add-on (wkTerrainSync):
https://github.com/nizikawa-worms/wkTerrainSync/releases/latest/download/wkTerrainSync-release.zip
If I end up hosting matches for 22chan, they will be located in the #AnythingGoes channel with the password "caturday". Let me know if you have any questions about gameplay or installation, and maybe I can help. Here's a big gameplay tutorial to get you up to speed on advanced tech:
https://www.youtube.com/watch?v=PtaMXeFRm-s [Play]