The first compile of everything takes a lot of time; from then onwards you’re just compiling individual modules, and your game module shouldn’t take more than a few seconds. I just tested the (commercial scale) game project I currently have open and it took 10.27 seconds, which isn’t exactly long at all. It can also be compiled from within the editor, whilst the game is running. If you have small changes like variable value tweaks, you should set these things up to be editable from within the editor and without the need to recompile.
The OP’s problem (and potentially yours) is his workflow. You need not suffer regular, long compile times.
Switching to C# isn’t going to make an 11 second gameplay module compilation much quicker.