First, this URL https://covidgame.info/ loads the game in English by default. There was a plan to popularize the game outside of Czechia but, frankly, we missed the window when major news outlets were interested.
The game source code is here: https://github.com/swehq/corona-game
I added few comments on the other thread: https://news.ycombinator.com/item?id=27763873#27766930