Just in case you did not see the description.
Flip a Buff
Goal is to make it through the onslaught of mobs. Find coins to randomly buff your max health, defence, offence, agility. They can also heal you. Catch is that from a flip of the coin you could also loose those gains. Also half the map would apply those buff to you while the other side buffs the mobs and vice versa if you go to the other side.
If the left side of the map is too hard, just hope you can de-buff them by the coins collected from the right side.