Do cute ninjas and tower defense mix? Find out in the fifth edition of Extra Life.
Note: The following is all written in streams of consciousness during my time with the game.
The presentation is truly adorable. This art style is awesome at first glance, and the opening video shows it off.
You start off in the Suburbs, which is a district of Ninjatown. It looks like each district has a few levels inside of them.
The dialogue is funny. In response to incoming enemies: "We need pastries! We need pastries!" "Fetch me my formal mustache!"

An example of the dialogue
Well, now that the game is underway, it is very clear what type of game this is: tower defense. It uses the touch screen effectively, letting you maneuver a large map, and have good control over where you build your ninja huts. Right now, I can build two different types of huts: Wee Ninja and Anti-Ninja. Wee Ninjas appear to be the basic grunt, and Anti-Ninjas are a little more powerful. You can build and upgrade these as you gain cookies from defeating enemies.
The second level adds another wrinkle: Ol' Master Ninja powers. He can blow enemies back (using the microphone or the D-pad), or boost individual ninjas. This game seems to be a by-the-books tower defense game, but it's so damn charming.
Now ranged Sniper Ninjas enter the fray. They have Wasabi Pea Shooters. As previously stated, this game is cute. You can also make Modifier Buildings, which boost the attack power of any nearby huts. In the final area of the first district, there are boss enemies, which are much harder to kill.

With one area down, I feel like I've played enough for this feature, and so I'm going to put the game down…for now
Played all four maps in the Suburbs, which equates to roughly 10 percent of the total game. Totally got an A on each level I played and smiled every time the ninjas did something cute.