Sonic CD is far from perfect, but it's pretty alright if you're willing to learn it's quirks (coming from a Sonic fan lol).
That aside, I absolutely love how the background captures the aesthetic of the Japanese box art for the classic Sonic games, and the little emotes the two do are great addition as well. If I had to make one critique, it's that Amy and Metal's colors seem a bit desaturated compared to the background, and really, it's not that big of a deal. This is just a lovely and charming work.