Hi, As in engine and stuff? Well I developed the game on Godot 4.2, which has its own native coding language and node system which I find easier to work with, and all the assets and sprites were drawn by me on Krita. Sound wise I got most from leftover sound bits from other projects, but a good few were from pixabay, so some cheeky free sounds. :)
[btw sorry for late response I only saw now lol]