Filler might not be the right word, but you said it yourself, the second part was tacked on as an afterthought and when I read that in your post it immediately made sense to me. There is one somewhat tricky part to work out, namely, how do you turn the crowd at the right. But most of the skill placements fall into place because they can't go anywhere else. So the second part feels more like a set of little tasks than like another puzzle as a whole. I guess after the excellent first part that was a bit of a let-down to me, especially considering I'm a fan of short levels. The part left of the gap is small and dense of ideas, and the part right of the gap is quite big and spread out. The left part on its own stands as an excellent level to me.
If you're about perfection or naught, then you're gonna have a hard time because in reality there is no such thing as perfection.
Has anyone else tried Las Ranas Hermanas? Or is everyone wary of trying out Lix?