I am so glad I found this and your YouTube channel in general since eventually I would like to have 3D objects in my game alongside 2D sprites. The image that you have posted on your GitHub page is exactly what I will be aiming to do since I would like to recreate a Pokémon Gen5 type of look with the flexibility of GMS2 it is going to be really fun.
Just purchased GMS2 Desktop and have already reached parallaxing and a following camera with the Space Rocks tutorial by YoYo in GML.
I would be happy to pay you to be a private tutor for GML if you would be interested.