You can Jump, throw candies and clone yourself, but before you need to collect candies to throw and blue potions to clone. You can beat some of your enemies throwing them candies, othes by jumping over they (but be careful, it not work whit all) and you can fing more ways to defeat them.
Keyboard controls
Arrows R/L to move
Up Arrow to jump
Down Arrow to clone (blue potion needed)
Space Bar to Throw candies (candy needed)