Get back here!G 5

Get back here! G5:
Kill 50 chochinobake

Chochinobake are the quick lantern looking creatures that first appear at wave 12. They are distinguishable by their small blue lantern shape, their laugh, their low health, and the fact that they run right by you. As mentioned, these little creatures run directly past you, so you will need to backtrack to finish off killing them before they do too much damage to your gate. This will unlock during regular progression of the waves, so kill 50 of them in any manner to unlock this.