I am absolutely stuck right now. If anyone has some ideas they're not gonna use feel free to toss them this way.

i have some spare ideas

idea 1:

 End  ->  death(3 lives)

 Each death gives you new weapon

idea 2:

 PvE arena - if you die you become your enemy

 5-7 different mobs

idea 3: 

 if you kill an enemy he becomes your teammate with very low hp

Phoenix