First off, LOVE the game! So clean, great gameplay, build customization, and graphics. Loved the story as well and usually don't get involved in the stories of games.

Unsure of any of these have been reported or not, but here are a couple of issues I've run into after playing for roughly 10 hours or so:

1) Damage numbers sometimes take a split second (I'd guess like 100 - 250 ms or so) before showing up after the hit looks like it's been registered. I've gotten used to it but it really threw me at first. Definitely seems like an issue or bug.
2) Sometimes hits don't seem to register at all - are these "misses" or just entirely unregistered hits? If they're misses I feel like it should say that.
3) When you exit one of the endless dungeons and click on the NPC to turn it in, and you double click on him (which I've done by accident a couple times now) the turn in dialog pops up and then is immediately covered by the "do you want to enter a new endless dungeon" dialog. Seems like both events shouldn't register / make both dialogs pop up.
4) When moving items to the bottom of my inventory, if I click an item, then click on any of the bottom squares in my inventory I get a "You can't swap these items" error and the item will not move, despite the white boxes indicating that I should be able to move it there.
5) Hovering over where the stamina circles are when you have the inventory open displays the Stamina tooltip, despite the mouse being in the inventory window.

Edit: Added #4 and #5