I loved this game, it's so adorable and once you find the groove it's very easy to pick up. I've never needed to find a coffee so badly in my life though ;)
I had a little trouble remembering the combat triangle. Something about chips and fries are just so similar to me that I was always mixing them up. Maybe if there was a graphic on the HUD that showed the relationships it might have been easier to plan.
I did get confused when fighting the boss - I couldn't tell that only one crystal was vulnerable at a time. In hindsight it made sense that the flashing one was vulnerable - after all that's how I could tell all game that something was vulnerable - but I think when I saw the crystal flashing I just thought that's how crystals were, y'know?