I am not a fan of the aesthetics but there is a lot of work behind this one. The lighting is also an interesting mechanic, I never thought it would be possible to do something like this with GameBoy limitations. It really feels like a fleshed out game, I had a good time with this one and probably play it again in the future ;).
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It's difficult to say, but I think it's because all "sections" are composed of a single color.
For example, the lighting looks like 3 circles (the seperation is harsh). The floor is composed of one color (with another for the borders). I don't think it's a bad choice to be honest, it's just a matter of taste ;).