The visuals are nice, an interesting way to animate the main character! The premise is wild: like you've been tasked to watch after hedgehog and now you're in some really creepy dungeon. Does Lucy live there? Or did you go for an adventure together? It's hard to tell. I love it!
And yeah, hedgehog does add a bit of complexity to the platforming puzzles, but gods, the fact that you can't move while holding him is a bit obnoxious. Also the fact that he randomly decides to backtrack to the start of platforming section.
I think if he had some use in the game and wasn't just a follower you are REQUIRED to take along would've made him much less frustrating. Like Companion Cube from portal. Like if you could place him on spikes and use him as a platform to proceed.