lmao I saw yours right after I submitted. I like your minimap and UI, I still need to figure out how to do that all properly. It was my first time doing UI's in unity.
I think the biggest thing for making UI responsive to different resolutions is to use canvas scaler (if I remember correctly, it's there by default on all canvases) with "scale with screen size" option. I usually crank up the scaling factor to screen height.