I tried the demo for a bit, but the game is unplayable for me right now because from the beginning of the game, I can't get the character to land onto a platform with just a single jump by holding the A button down, thinking for him to jump higher when you hold it down, but it doesn't work. Maybe the platforms are a littler too high to even go up in some levels, since I can't figure out how you get the meta-progression orbs or something that lets you buy an upgrade to jump higher by holding down the jump button.
In addition, I can't seen to figure out what the buttons are for an X-box controller, since all of the controls in the "mapping controls" menu are for a keyboard, which I don't use for real-time games or hack-and-slash games like this one in the category.
Thought I share that thought right now, since I don't want the game to be unplayable just because the character can't reach a platform through a single jump onto it, banning you from ever be able to go back up, especially when you missed an enemy in a combat room on a higher floor then you and you can't reach them due to a single jump not getting you to the next platform. At least make this feature where a single jump reaches you to a platform just slightly above ground from the beginning of the game.