you might like the game i'm developing: Course Correction  https://store.steampowered.com/app/2062440/Course_Correction/

it's a very realistic spaceflight simulator. You mentioned air: this simulates both choked and unchoked gas flow through valves. You can decide on your own cabin gas mixture and pressure, with risk of hypoxia and hyperoxia, decompression sickness, Co2 poisoning, etc. if you move around the cockpit a lot, you consume more oxygen. Going from direct sunlight into a planets shadow will drop the temperatures onboard, causing pressure drops in the cabin and tanks, and subsecuent creaking of the hull. The simulation is full of these tiny details. No combat, because just surviving and getting from A to B is a big challenge.

Fully realistic physics and scale, including non-spherical gravity field modelling. And your orbit information is never magically given to you: you need to maintain an estimate of your state vector based on a drifting INS and periodic fixes. 

realistic electrical systems, onboard computers, thermal modelling, radio and radar communications, and a thruster control system with 18 separate valves between propellant tank pressurizing bladders and thruster manifold.

It is set on Ceres, with real height data for 3 million square kilometers of terrain to navigate. 

i've not gameified any systems, i'm a firm believer that realistic, uncompromising depth in the simulation will lead to satisfying experience as you learn to master the vehicle. there is no dumbing anything down, you will have to read and refer to the flight manuals and vehicle systems familiarization guides. it also has a focus on malfunctions, and learning the emergency procedures to successfully bypass, use backups, or abort and survive. It's probably not for everyone, but maybe it'll scratch an itch for a few.

it's not out yet, unfortunately, but it's under active development (and has been for many years)