Koji, you are legend in my book.
Man, the simplicity of this combined with the catchy melodies and a powerful percussion part is a testament to true genius. Very, very well done Koji. You have outdone yourself with this piece. =) You've really created a happy mystery feel of trudging through an almost magical, unknown, but not scary world.
So, I love the new melody. Love it. And I really like how you transition to it, it adds a lot to the whole piece. The countermelody is great too except for just about a few notes. I love the mystery sound it gives to it, but at times it sounds a bit too dissonant for it's own good, but you are talking to a great fan of dissonance here, and overall I very, very much like it. I also think you may have wanted to change your drum part up just a bit under the new melody, but it still sounds great.
All in all excellent job! Extremely impressive and I would love to check out your visual novel when you are finished. =) Also, what are the instruments you use when you created this? Like what programs?
Incredible work! =)