I like the art style and the concept, but I couldn't really figure out how to place a block. I got a sequence (1, 2, 3) all of the same color and it wouldn't let me place it or anything.
Thank you for your playing. This game is like a Burgundy castle, for example, mountain blocks are connected to mountain blocks. If you synthesize an unusable block, you can throw it away using the trash can icon in the upper right corner.