Thanks for the question! The game is made with MonoGame, which is basically a modern version of XNA. I like it because it gives me a lot of freedom with how I program the game, although it does mean I have to program most of it from the ground up.
That's a very interesting game engine! I can't actually say I've heard of it before, but I think I'll look into it.
Thanks for the info! And keep up the cool development!
