Throughout the stages, you can "collect" various animals that spawn by feeding them to Maw, with only a certain amount needed to make Maw big enough to exit the level, and the game will tell you when that's the case. There isn't much of a reason to collect them all that I've seen beyond just getting a little gold medal for the level, so there's no locked content behind that. There's also a special collectable gross bug thing that I forget the name of, I think it's... Snuffle? They also get you a little medal and a silly animation of Maw really enjoying eating it. Beyond that, you try to find where animals hide, try to find out how and where to use the powers that Maw obtains, and make your way onwards. There are a few "deleted scene" levels aka DLC levels, and they're automatically gone to where they were intended to be in the game, but you can just choose to skip them if you so desire. They don't add anything huge to the game, but they are a couple more levels, including the odd Speeder Lane level which is the only level you can die in. But don't worry, there's no penalty for it, it just sets you back at a checkpoint, and they're plentiful and anything you've collected stays collected. Even the stage boss starts you off right where you left off with it.

The game has music that changes to the situation, such as being quiet and calm ambience when nothing's really happening, picking up when shenanigans go down, and even having more instrumentation added when Maw is doing something with powers he obtains. I found it a rather nice experience.