OK, Eclipse Phase plays in a future where all humans (TM) left dont have one body, they have multiples.
if you`re popor its a simple, basic organic and your Work body, if youre a spacer its adapted, its core is really transhumanism in setting and characters.
Regarding what you actually do, its quite open, but tows the line between Transhumanism in its Glory and its Dystopian version.
The 2 longer running games I palyed were a "you are elite Interceptors/hitmen of X" style, which was great fun and also allowed us to unveil some ... less ssavoury things in the setting, which ended in us rebelling and sadly dying permanently (or being black Boxed as its called most of the time^^).
The second was more or less Shadowrun in Space without Magic.
The Setting itself is a weigthy one, yes, but the System itself is of medium complexity at most.
Sorry, the alst game was 2.x years ago, that about as detailed as I can get without reading into it again myself.
overall I loved the setup and kinda liked the System.
And its Free.
Edit: See it as a more SPace/big Picture focussed Altered Carbon RPG with a better Setting, and you`re not far off.