First the quality and design is bland. I decided to let it slide. But then there's the aspect of the game as a puzzle which kinda hit me hard... its very simplistic. I can easily identify "where" to go "what" to get and it makes it like I said simplistic... and this strikes me hard because... well mainly I suck at puzzles... It lacks a bit on the story as well.
So basically, if possible improve the design all around. That alone will make me add another half star.
Added more of a story? That's like 2 stars... I'm an RPG's mama boy.
Though changing the mechanics of the puzzles will probably take a while since it's all there in it's simple stature... I cannot give any help or advice towards it.
Personally I couldn't finish the game as I got stuck on the second room with 2 diamonds and a lever... I was lost hue hue.