Sorry for the late reply. Thanks for the feedback. I didn't originally intend World of Blocks begin specifically for Minecraft, just in general for games that has blocky appearance (like Terraria). Minecraft just is the most known one so I went with it. Just like you said, it's a good variation to use other keys too (than what the current key signature uses). This applies to key signature changes and transposing too. There is a soundtrack called "Bloom Nobly, Cherry Blossoms of Sumizome ~ Border of Life", which has something like 5-7 key signature changes in it. As for transposing, I think it makes the transposed part sound more intense when you first play a melody and then repeat it, but transposed up a bit.
By the way, few days ago I uploaded a new original song to YouTube that you might want to hear.
By the way, few days ago I uploaded a new original song to YouTube that you might want to hear.
Spoiler
It's PMD related 

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