EV was (and, really, is) very much a mac game. Mac Versions Here!
The genius of Escape Velocity was its mod potential. In addition to the TCs linked on the home page, there are numerous smaller mods ("plugins") which change improve or bypass gameplay. There was the official add-ons page, now replaced by a remade version
If you still need that top down space travel fix, there are some currently supported options:
FlashTrek and sequels