Collect the large floating coins whenever possible. They are worth a lot of coins. They usually appear between rows of normal sized coins.
Stamina
Use your punch ability to charge forward and attack monsters. Although this uses a lot of stamina, you will get most of it back if you take out a monster with the move. Taking out monsters will result in a nice amount of points. Unless the current level features high placed gems, try to remain on the ground as much as possible. Recharging stamina is very important to your survival. This will also offer a better view of upcoming dangers and obstacles. Flying can be used to escape danger when used correctly, but is costly in stamina.
Upgrading
The other playable characters must be purchased with the game's premium currency. You can instead improve the starting hero by spending coins to improve his overall stats, flying ability, and punch ability. Consider upgrading his stats or flying ability first.