Played a fair bit of the demo, got like 10 cards. Really awesome game, i like the 3D style. Is this gamemaker? how did you do the 3D :)

Yep -- we're using Game Maker Studio 2. I can point you to the documentation for Cameras, but I don't think I could explain it very well myself. Through a lot of trial and error we somehow got our 3D camera to work, and then we didn't dare to ask too many questions. Anyway, thanks for playing!