Hey mate, thanks for taking the time to give me some extensive feedback. I'll be looking more into significantly altering each graphic setting so it can run better. I have just released an update that should fix the framerate issue. I'll be releasing a few more future updates (hopefully) to fix some more problems. Unfortunately I don't use Unity (especially HDRP) often so still need to learn more about the engine to make some more changes. I may also add additional models in a new update.