Thank you for such a detailed feedback!
I am glad you like the authentic as I was afraid not to pull it off with the limited palette. But that seemed quite interesting of what's possible to do with just 4 colors. I never had the original game boy but had the Color one, I was always amazed by how smooth animations were on those, and the crystal grid made pixels clearer than anything CRT rendered at that time. So I went for this feel of grid rendering, and now it's really easy as all is handled by the engine.