Good question andregs,
Here's a rephrasing from our FAQ:
The fundamental concepts and gameplay are present in both the PC and the mobile versions of Osmos -- but there are quite a few "structural" differences.
- PC uses mouse controls of course, which work well IMO.
- PC has fewer "regular" levels, so the difficulty curve is steeper; and some of the levels are different.
- PC has an "infinite" amount of progressively-harder bonus content once you've completed the 47 regular levels! Not easy to unlock, but once you do, it can get crazy. eg. Want to battle 96 Feraxes?? (
http://www.youtube.com/watch?v=arfIB53BcdI) Note that your mileage may vary depending on your machine's processing power.
Cheers,
Eddy