This is an awesome game with the perfect difficulty level for me.
To you players who have problems with a medal:
Learn by doing is obtained by beating the first level without reading the sing with an X over. Nothing's for free is for trying to purshase something whith insufficent coins. I'm outta here is for skipping a level by clicking the fourth button to the left in a level. All that hard work for nothing - buy out the shop. Then while being on the highesr floor of the third tower make sure that you have 100% all levels before that. Take all coins and the artifact on the last level. then complete it. Now you should have all medals. Sadly, there is a chance that a medal do not unlocks.
The graphics are good. The map looks nice and I like the animations of when a new tower pops up. The only thing that annoyed me was the godamn snakes.