6ish hours in: 7 tools, 36 eggsies, 2/4 flames, i think most of the candles lit? (There is a room near the starting room that suggests there are 9 candles and I think I lit 7 of them).
I did find another, other collectible: a medal, which kinda broke my mind when I got it.
Still quite a lot left to do, i do know of one platforming section I am refusing to do which is the room to the left of the first rabbit you see in the game. from what I gather it requires perfect sequential bubble hopping and I just can't do that shit, I can do about 5-6 in a row maximum