Today's Free App of the Day: Galaxy Ninjas
I think the product description says it best:
"Galaxy Ninjas is an epic 2D Ninja game! Slay aliens across multiple levels in the galaxy while dodging obstacles, collecting powerups, and surviving insane boss battles! Collect coins and head back to the Dojo to customize your Ninja with new outfits, weapons, and powerups! 4 Different modes include Classic, Expert, Endless, and Insane for the pro players!"
OK, I didn't know there were pro Galaxy Ninja players. ;-) But one reviewer does comment on Insane level as being "insane." 3 1/2 stars after five reviews. Normally $0.99.