The easiest way to progress in this game is to use life-saving power-ups as they will make it much more difficult for you to die.

Rocket (15 Coins):
Helps kill monsters, but you can only use one per stage.

Booster (20 Coins):
Beat a level in fewer jumps. Similar to Rocket, you can only use one per stage.

Warp Totem (30 Coins):
Sends Jumpster to the next level. One per stage.

Barb Blocker (30 Coins):
A shield that protects Jumpster from spikes. One per stage.

Cosmic Cupcake (45 Coins):
Restore half of Jumpster's energy.

Silver Key (50 Coins):
Unlocks Dilonica levels.

Martian Cocktail (75 Coins):
Fully restores Jumpster's energy.

Golden Key (110 Coins):
Unlocks Yutaka levels.

Respawn Relic (500 Coins):
Lets Jumpster respawn where he died.

Space Fridge (600 Coins):
Stores 10 energy bars at a greater discount than the price of 10 treats (Cosmic Cupcake, Martian Cocktail).