Seems like you would be spending a lot just to play the game in its entirety :s
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I don't know if there are any freebies. I tried the tutorial three times and couldn't finish it due to broken scripting.
There are two selections available from the free prologue. I had no problems completing the tutorial, but it's impossible to complete all the objectives in the action mode, because your count for evacuated friends never goes up. Just to make sure the people I picked up with the circle button were the friends I was supposed to be evacuating, I ran one over, and sure enough it caused the objective to fail. Even if you could get the count up from zero, the UFOs and friends spawn infrequently enough that they could make it difficult to finish within the time limit.
The game seems relatively fun to me, and it certainly wouldn't be among the worst of its kind if some quick fixes and upgrades were implemented, but I also definitely wouldn't pay more than a couple dollars to unlock more content; the outfits and personal space are worthless to me. On a humorous note, I discovered a glitch where you can make the vehicle spin around, fall into the ground, and then bounce high into the air and out of the map, if you ram into an object in a crater at full speed, with a power boost activated.