I couldn't win the "easy" path, I think I'm bad at the game x)
It's interesting to add minigames to a tower-defense in order to gain money, though after a while they feel pretty repetitive, and I'm not sure how they are connected to the rest of the game (are the aliens doing a 9 to 5 to earn credits?). The upgrade menu is pretty hard to read, I couldn't really get if I bought a mutation or not. It is still a pretty solid tower defense.