It also abandons the "character action" style most associated with the studio in favor of, well, more characters. Your superhero protagonist can recruit a coterie of random citizens (by drawing a circle around them with the right analog stick) sort of Pikmin-style. However, instead of simply directing them toward the giant robot enemies, you wield your crew as weapons. You can hit a button to do basic "team attacks" that essentially use them as a bludgeon.
If you want more powerful attacks, you can wield your crew as a giant sword, pistol, or fist with a touchscreen gesture. This is basically the "Wii U" element of P-100; otherwise you're just doing combo attacks on giant enemies with the buttons. These take "battery power" that you can charge with successful basic attacks.
Being a family-friendly game, the action is a little less intense than, say, Vanquish, but you still have a variety of offensive and defensive options that let you vary your attacks, dodge, and block (forming some kind of glowing energy ... Jell-O mold around your group). You can also use that "fist" item to grab and manipulate giant switches and knobs.
I mentioned earlier that the game is uncharacteristically cute for Platinum. It has a look that's pretty common to Wii U launch games: it looks like a Wii game in terms of bright colors and simple character designs, but in very smooth high definition with a tilt-shift effect to make everything looks extra tiny. That's not a knock: it's nice to see a "Wii" style game without the jaggies and with more detail.