killersheep VS vim9jit

We all know that the real must-have plugin is vim/killersheep.

I guess that I sort of did actually answer your question: there are plugins that work on Neovim but not on Vim, but the only plugin I found that worked on Vim but not on Neovim is vim/killersheep, so you get more plugins at no cost.

I'm looking for games (snakes etc) that can be played inside vim/nvim but I haven't find good ones. killersheep can only be played in Vim, vim-snake doesn't work that fine ...

You can play the killer sheep by the grand master. :KillKillKill!

Playing hidden game in vim

That's not happening any time soon, but there's this project by one of Neovim's contributers that transpiles Vim9 script into Lua.

Probably feasible with https://github.com/tjdevries/vim9jit actually

There's https://github.com/tjdevries/vim9jit. It has reportedly been used to port Vim9script runtime files to Neovim.

Neovim is going to use a transpiler that covers vim9script code to lua code using the nvim api in the future (https://github.com/tjdevries/vim9jit)

I didn’t watch the streams because I wasn’t totally sure what he was even doing, but maybe this will take some of it off your hands: https://github.com/tjdevries/vim9jit

It could (rightly) be argued that neovim could just merge in vim9script, but I think this probably isn't the best more. I'm personally more in favor of getting a vim9 cross-compiler working, that way there's an easy way to support both. But that's my ignorant two cents on the matter.

A core contributor to Neovim is toying with a Vim9Script to Lua convertor.

That's not necessarily true.

Core maintainer of the Neovim Tjdevries is working on a compatibility layer that would allow vim9 to not only run in Neovim, but likely faster.

Source: https://github.com/tjdevries/vim9jit

My understanding was the neovim folks decided this wasn't work the hassle. TJ already has https://github.com/tjdevries/vim9jit, which transpiles vim9scripts to lua, and that is much more likely the way things will go.