This level is know by crashing your game sometimes after you beat the second enemy in the beggining; the reason of why it happens is simple: once the enemy is alive or even only on the game, and you jump to the next platform the game will crash. To avoid it is pretty simple:

¤ Spin the enemy and make sure to wait 1 second or so before jump to the next platform; if you spin he, then soon after jumo to the next platform the game will crash because his 'throwing animation' is still playing.

¤ Jump on the enemy. This is the best way and the only way I highly recommend, because the animation ends really quickly, so you don't need to wait where the enemy was before jump to the next platform.

I hope this topic will help any runner interested in this game!