It seems to me that opening your Inventory pauses the game. My health and mana don't regen when the Inventory screen is open, so this is effectively a pause.
Gah! Ok, it needs to save your progress. I went back to the main menu thinking it would be an easy way to restart the level, and then it started me over, completely!
Not a bad game, but I like the difference games where there is a cursor in both pictures. That way, if something is missing, I don't have to move to the picture that has the element, my cursor is already there no matter which picture I'm hovering over. Trying to click where the element should be is risky.
Fun game, but it would be nice if the count down timer at the end of each level could be skipped, and if the High Scores submit form would remember the name you've previously entered. Honestly, I don't care about those things at all. I'd just like to skip them, so my suggestions are just ways to get through them as fast as possible. When I finished a level and wanted to move to the next one, I didn't like having to sit through those portions. I wanted to skip them and get on with the game (which, as I said, if fun!)
For the Collector of Fire achievement: Levels 4, 13, 17, 19, 22, 24, and 25 have orange collectors. Just complete any combination of those levels ten times.
I only collected 15, 15, and 10 gems before the "time machine" (that let the dragon use his flying saucer) was activated. How many gems total was I actually supposed to collect?
Frustrating ending. If it's not the end of the story, at least give us a taste of what's to come rather than a "To Be Continued" after the credits roll.
An option to not not show possible solutions in the window at the bottom would be a plus. The game is too easy, and therefore not really interesting, as it is. Also, here's another request for a "next puzzle" feature. With such a slick UI, the lack of this feature really stands out.