after you finish doing all the acchievments óf of the game, have an option to reset the game to zero, but that will add to a hidden multiplicator that will make everything (other than curse) doubled - double mob health, double damage but double coins dropped (also rrsets all the secrets and acchievments and their unlocks back to zero and costs double to buy back)
finish again? reset again for 3x
finish again? reset again for 4x and so on
#new game plus
rare grove
slim void
pretty cool idea
ancient swallow
That's not ng+ that's a prestige system
But still pretty cool idea
But I doubt many will do the achievements all over again
slim void
trust me there are lots of ppl that reset their saves to do everything again