Right, so this is my very slight variation of Project Boost. I’m eager to move forward so I didn’t put too much time into this, but I can see myself going back later and add points and fuel systems.
What I did do is tweak the controls, since I wanted to steer with my right hand and boost with my left. Also, in this boost-version, you can control main and booster rockets separately. Or indeed fire all of them at once for extra kick. Each rocket of course gets a separate particle system. Also, the RCS thrusters get a tiny particle system of their own, to enhance the realism a bit. 
A = main thrust
D = booster thrust
left/right arrow = RCS left/right