As a platformer it's a little clunky, both in the stained glass puzzles in the Inventory and in its jumping (lots of buttons to take into consideration and they're all in weird spots) and none of the controls for the keyboard are very intuitive. Additionally, it would really solve a lot of problems if the demo mentioned that the button for Shatter (the key to even starting the first puzzle) was Ctrl, as it's not exactly a button I'd think of using in this sort of game. Finally, the last demo level glitched on my first run through--not allowing me to get the final glass piece and not allowing me out the final door.
The soundtrack is excellent, the journal entries are both helpful and intriguing, and the visual are gorgeous. Death himself isn't much to look at, but the stained glass monsters are almost a shame to break. Also, the combat itself is a bit of a puzzle since Death doesn't start with enough health to just hack and slash without thinking. Over all, I think that the pros outweigh the cons, and I'll probably buy the full game soon.