Thanks for asking, the game is made in Godot. It's great for UI heavy gameplay such as my game, and an absolute joy to work with.

Great to hear that.

What language have you been using for the game logic? Straight up GDscript or are you using a different language binding?

Yup, straight up GDscript so far. It's a wonderful language for iterating quickly - and so far I have not needed the extra performance of C#. And the performance bottlenecks that are in place so far are mostly due to the architecture - massive gains to be had by just refactoring some GDscript, don't really need to change language.