enderger

I'd say integrating a singleplayer "simulation mode" for testing flights that you need to be able to revert should be implemented (presumably able to take place at any point in time) and a system for time warp voting (limited by the player whose status demands the lowest time warp setting, perhaps voting to warp a certain amount of time so that nothing interrupts it) would be the best feasible way to implement this. It avoids having to resolve paradoxes, allows for testing craft (and adding a bit of pressure to get the real flight right), handles the case of crafts in conditions where time warp is unsafe (possibly providing an option to prohibit new flights and prompt in-atmosphere players to land should the threshold be reached in order to avoid warping problems), and allows for people to execute their maneuvers in chronological order (a vote for n is also a vote for m if n >= m).

When does it release on steam?

I personally feel that Kerbol does not fit with the position as the sun. I personally feel that the Soon would be a bit of a continued play on the Mun's name. By switching the Soon and Mun's vowels, you get the Sun and Moon.