If you're interested in making your own game, please feel free to reach out on Discord: https://discord.gg/cx3usBCWnc
Or refer to some existing WASM game examples: https://github.com/extism/game_box/tree/main/games - currently games can be built using Extism PDKs in any of Go, Rust, Javascript/Typescript, Zig, Haskell, AssemblyScript or C/C++!
Not really. We've talked about a next step being some kind of development environment for this. Our plug-in playground environment comes close to this, but you can't currently set or use plug-in variables in this tool: https://playground.extism.org/
To make development smoother, what I've been doing is separating the game code and the Extism code. Write unit tests and test harness code against your game code and run it on your host machine.
There aren't yet high quality docs. But if you want to give it a shot I'd try forking one of those and asking questions in the discord: https://discord.gg/tukQnCME
