Thanks for the replay. That is defiantly not intentional. The thruster should just work by holding down 'z' key. Did you play with the web build of the game or the windows build?
Ok, I did some testing and I think you were playing with the web build. Yeah, I had the same issue. How I fixed on my end was to refresh the page and it started working. I'm going to have to look into this more to see if there is a better work around for it. Sorry about that.