I'm glad you liked the game!
I use the Godot Engine which uses it's own programming language called GD Script (which has syntax similar to Python). I created the models in Blender and the textures were created using Krita (and some PBR Textures were taken from free sites). SFXs where created by taking from free sound effects libraries online and splicing them in Audacity. I think that pretty much sums it up.
As for future updates, I do have plans, but I can't guarantee anything at the moment.