I believe you typically get extra Picrites. Plays into the whole F2P nature of the game, I suppose. For us, time counts toward the total completion percent of the game, but not for anything else. If you complete 50% of the game, you'll unlock the Bonus puzzles, which are stupid hard.
There's also no progression gates in PixlCross, you can play any puzzle you want in the game (with the exception of Bonus). So if you're a more experienced player you can just skip to the Medium or Hard puzzles and get a tougher challenge out of the gate.



