It's very hard to know which ingredient is currently selected, and it's possible to select the "right arrow" even when you're at the end of the list, meaning that I spent half the time baffled that mouse clicks weren't doing anything. Other than that, the UI seems quite smooth and nice. The game's a lot harder because you can't use the same ingredient twice! I expected the "troll's eye" to do something special because I was especially given it in the opening cutscene, but maybe that's just misinterpretation.