Ive uploaded a demo of my rocket here https://sharemygame.com/@Flinx/test-rocket
It was puzzling. I was able to use thrust with a mass set at .8 in Unity but when I uploaded it, I found I needed to set the mass a lot lower. From memory it was at .3 or .2
I put a caption with the upload that its a challenge to land it safe tapping the thruster as it comes down. sort of a basic game I suppose in itself