This is a pretty interesting little puzzle platformer. Basically the idea is that you have several characters that represent one of the seven deadly sins (sloth, greed, lust, wrath, pride, envy, and gluttony) and each one has a special power or two that will help you get past certain obstacles.
Greed for example has a grappling hook made to connect to various hook areas in the level, and he can also use this to grab powerups and pull down enemies who are flying. Pride has this ♥♥♥♥♥in armor, and sword and can do a charge move that allows him to horizontally extend his jumps. Gluttony can eat enemies for extra healing (though it doesn't happen instantly, you have to digest them a bit first or it just vomits them back out).
You can only play as one at any given time, but you can switch between characters freely as many times as you want during a level, and there are various shortcuts to making these choices (told to you as you play). To top it all off, apparently there's a co-op play mode where you can each play a different character, though you presumably can switch between any character at any time (so long as it's not already in use).
This is one case for sure that I'd recommend using a controller vs trying to use keyboard and mouse. While you CAN play with the keyboard, it feels awkward and there IS combat to worry about. I assume you could just spend the time to "get good" with mouse and keyboard, but it's not going to grant you any real advantages over the controller here.
The story is mostly forgettable and only really exists to explain WHY you're playing as the seven deadly sins. It's the most unnecessary exposition since "Are you a bad enough dude to rescue the president?". Maybe it'll get better later but for the most part, watch it once, cringe, and then play and forget it exists.
I haven't seen anything that complicated or challenging, but I've only played through the first few levels. Maybe the story and challenge will improve as time goes on? Still though, it's a fun game and worth the purchase if you're looking for a nice little platformer to play.