Billy Hatcher and the Giant Egg set out to be a very interesting new IP for Sega, but it really just ended up a mess. While a lot of the ideas of Billy Hatcher are good, like taking care of an egg throughout the level or the animal abilities you get, they aren't enough to break away from the design flaws of this game. The camera is a mess to control and has terrible fixed positions, the game controls wonky and disjoint both as Billy and the egg, and the level design intensives the previous problems with more unforgiving platforming and harsh difficultly.
Might just have the strangest pacing I've ever seen in a video game. "Save the Elder! Defeat the Great Evil! ...go play minigames or mindlessly kill some random enemies, I dunno man. It's required content!" Imagine saving every sage in Ocarina of Time but then Zelda yells at you that you're not allowed to fight Ganondorf until you've played at least 6 combined hours of the shooting gallery and the chest minigame. Just absolutely bizarre, the only "compelling" content is the first two levels of every world and everything after is weird filler nonsense that would actually make sense to do if it happened before you already defeated the boss of the world, but it doesn't. Just a really weird game, at times I had fun but mostly it's just kinda badly designed and very clunky.