It is a really great start for a first game so good job.
I really liked the design of the first map but wasn't able to visit because i wanted to follow the story telling.
I found the second world a bit repetitive, you used the same bambous and bushes all the way long. I think it is also the cause of the performance issue i encountered.
i found the search of the pieces a bit long because the only purpose of it was to discover the map and at this point the view got repetitive and my game laggy.
I would had loved to get back to the first dimension and continue the story telling into another adventure though :)