Simple Rocket 2 is a very good game, but lack of choice for engines
*I think it would be good to add more cycle for the engines as well as more nozzle. I think it would be good to add other fuel, but that has been said. What I wanted to propose is a more important choice of modification for the ionic engine, it would be good to add other fuel for this style of engine, other form of ionization, because there is not only one type of its engine.
With a few additions and some modifications on the engine flames, that they become more realistic, the game would become very interesting.
On these words, have a nice day
I've marked this suggestion as rejected because it suggest way too many things. Some of them already suggested in other, more specific posts.