I'm assuming this is a compilation of the free-to-play games that were available through Facebook (but now with touch screen support), right?
One issue I had with those versions was that you pretty much had to use points to "equip" power-ups if you wanted to try and beat your high score (at least in Pac-Man). You could earn points just by playing, but it felt like you were 'farming' for points in sessions that didn't matter between your real play attempts. (The alternative, and what they hoped you'd do, is to spend real money on points.)
Hopefully the point system has gone away, but I doubt it.