3 missions free, 3 mechs (2 unlocked through gameplay grinding). There is some challenge here but after a run or two per mission you should be geared up and experienced enough to complete it all.
IAP for a demo! It doesn't even tell you what you are buying. After beating the 3rd mission you can buy a Mission 1 pack for $2.99 with no description for what you are getting.
What's new: a double machine gun minion and a "base" teleport point that you have to defend while destroying the opposing bases (think the generators from Gauntlet mixed with the ROM from Tron).
The first map is completely new (mountain pass with multiple ramps and elevations).