Very fun game, solidly made, good graphics and sounds, music is slightly repetitive but pleasant.
Game can be completed in about half an hour, but unlocking all the achievements took me four hours. At the beginning completing certain levels with 3 stars seemed too hard but once you start trying it is just right, challenging but not teeth grinding hard. Displaying time required to get 3 stars at start of level is one of small things that make this game good.
The hardest thing was to find the hidden sleeping lizard. MILD SPOILER BELOW:
The legendary sleeping lizard seems to be unreachable by current jet-pack technology, a mere sighting of the heavenly beast seems to be enough to receive the achievement.
I also appreciate the ability to customize how the character looks with hats. My favorite is the very first one - pirate hat.
What could be improved - a little story why the jet-pack lizard is collecting these gems and a little Victory screen or movie once all levels are completed or perhaps once all stars are collected.