when will you update the game here? it says that the last time it got updated is on Aug, 17 2021 or is there any other place i can download the latest version?
Source code = the code behind the game
GitHub = a place where a lot of people keep public source code (public source code = "open source")
You can't install or run the game directly from the source code, you'll need to download the Godot Game Engine and do stuff through that. It's kinda complicated and you probably shouldn't go down the rabbit hole.