You cant really use it in your games, its more just a thing to type texts with and vibe.
There is this thing https://ash-k.itch.io/textreme2-ui-character-animation which has the buttons, toggles, sliders and birds you can drop into a godot project. There is currently no supported way to transplant text effects from textreme 2 to a different godot project because it uses modified godot engine and was not made with this intention.
However you could take a look at the source code for textreme 1 if you are curious https://github.com/cis-ash/TEXTREME. It uses a weirder and simpler system for its text that only works with monospace fonts, but the general idea is kinda the same.
