Well, here it i, we need something more realistic. KSP just isn't it, simplified is mentioned too many times when people talk about that game.
Here it is, NASA's actual simulation tools that they use: https://www.nasa.gov/reference/jsc-simulation-modeling/
These are freely available, so try them out.
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I think in certain universities you can get student edition Free Flyer and STK licenses as well. Not hating on GMAT, but ill be honest we use Free Flyer and/or STK way more often these days
edit: now that I look at it more GMAT isn’t listed which I thought would be most interesting to folks interested in mission planning/wanting a more ‘real’ KSP-like simulation tool.
[https://software.nasa.gov/software/GSC-17177-1](https://software.nasa.gov/software/GSC-17177-1)
If you want something more realistic than KSP but still want *a game*, as opposed to a simulation/modeling tool, you can try playing KSP with the RO or RP1 mod packs, plus the mod Principia for n-body physics, as opposed to KSPs two body patched conics.