This hits the sweet spot in terms of a short but deep incremental (12 hours to completion, though I was backgrounding it for large chunks of that time) which has a good, continual sense of progression without ever feeling grindy.  It wouldn't hurt to double check the UI - the buttons were often finicky, especially when trying to switch tabs or cast spells - but that's about my only complaint.  Neat little puzzlebox and the ending is, indeed, crazy.  Good job!