It is fine for a a small session, but gets very repetetive. Collecting gems to upgrade your preferred items gets very dry and grindy for no other purpose than getting another 5 levels deep. I know the demo mainly gets you to see the first boss, but if you choose to go further you will see that even with the teased unlockables from the steam page its not worth going any further even if you had the full list of things to buy. Its still the same monsters and the same level, just adjusted to the better gear.

I wish the game was something more than watching your dude kill the same monsters for the same loot.