Ok, after finishing the demo, I can say that I absolutely LOVE this game, and I will definitely buy it when it gets released.
That being said, I just have one major criticism against its mechanics, and is the fact that the ability to upgrade your character is very limited. You can only level-up a certain number of times. But after that, the game does not allow you to keep improving your character.
This was a huge letdown for me, because one of the things that was making this game addicting to me was precisely the idea that I could keep earning experience and keep upgrading my character to its maximum level. But the game doesn't allow you to do that. This means that you will never be able to achieve maximum health, strength, stamina, or speed, which means that your character will basically remain "mediocre" for the rest of the game.
And, like I mentioned earlier, this also diminishes the whole addictiveness and replayability of the game. Because, what's the point of killing all the enemies, cutting off trees, rocks, etc, if you're not able to earn any experience anymore???
I just really hope that this limitation only happens because this is a DEMO, and that the full game will allow you to maximize your character status.
Because, otherwise, this might affect my rating for this game (btw, I hope the developer reads this).