Despite the score-based setup, there was very little variety in abilities and game mechanics. That special ability where he creates an electromagnetic field... I think I've held down on that 100% of my time in the game. It's used for everything, in both taking out enemies fast and solving all the puzzles. And there isn't any input or techniques incorporated that could give the ability variety in use. It's a hold-down-to-win mechanic.
The level design itself is pretty basic and unmemorable, despite their attempts at making them feel interesting. I think the only one I liked was the Garden level. The enemies just felt like speed bumps then actual threats.
The boss battles were fun, at least, which is very Mega Man-esque, and were the only challenge compared to the level you have to run through to reach 'em. My favorite battle concept was the Haunted Warehouse boss(es), where you fought two characters, but had to beat them both at the same time as they would keep resurrecting their partner should they die.
Overall though, it's not something to sing about, IMO.