The GPU does max out in the 3D section through almost the whole thing and I have an Intel(R) Iris(R) Xe.
Thanks! Yeah, I also have one in my laptop so I know it struggles with anything more complex. I'll keep working on this in my spare time but optimising it enough so it runs on Xe requires rewriting all of the shaders and really crunching down the quality.
That's to say I'll try my best to get it running but it will take a lot of time!