Clones can help you, they can even save your life! Go in search of the exit and gather all the energy orbs to replenish your energy meter. Use your clones carefully: use as little of them as possible! Mind the pink spikes in the pits: jump over them or else it will be one big bloodbath. Sometimes it's unavoidable to use clones. In those cases a clone can be very useful to narrow a gap or to reach a higher platform.
Use the left and right arrow keys to walk and the up arrow to jump. Press X to clone yourself in mid-air.