Awesome game. One of, if not, the best game I've ever played. It kept me up until 4am last night and I had to be at work at 8am so this is a great start to my week!
It's cool cuz even my girlfriend loves watching me play it and kept bugging me to put it on so she could see more of the story and try to figure out some of the puzzles, so it gets a big two thumbs up for that!!
A couple of small niggles with the game, the biggest is that a couple of times I've got to a point where something has gone wrong and I've had to go back to a previous save point and start a puzzle again, for example in the challenge of Atlas I pulled a lever that I wasnt supposed to pull until later, when the time came that I actually had to pull the lever it wouldn't work again no matter what I did and I was stuck so I had to go back to a save point I made an hour before and do the puzzle in the right order and it worked fine. Another is that you can get to a checkpoint with no energy and no magic and then have to fight like 5 dogs of hades where you have no chance and when you die you start from the checkoint with no energy and no magic again. Nothing you can do but go back to a previous saved game again (or use a cheat!).
Apart from that the game is perfect. I have no idea how big it is yet, I'm far into Pandora's mountain running through Hades challenge, how much longer is left after this FlipMo?
Peace.