Awesome, but in my opinion, its not that hard

This game is very fun
BTW, it is actually very easy to beat any level
Yellow ninjas give magic coins for any dead creeps in range
Grade 3 yellow ninjas have increased range and get 3 magic coins for each creep killed by an ally in range
i found that having at least 2 grade three yellow ninjas makes it easy
having 3 of them almost guarantees me winning
the key to beating any level is tornado magic and gold-stealing magic
honestly, i might have lost a few lives trying to get grade3 yellow ninjas, but then i would win afterwards.

P.S.
Be sure to make good use of the pause button, as you can still upgrade or buy units and magic

Bababoyet about Ninja TD