Stock shells are slippery and feel cheap. Upgrade to a or a metalic midnight blue shell . Pair it with colored buttons — rose gold or clear neon green for contrast. Do not forget a glass screen lens.
The most likely candidate is (2012, Vblank Entertainment), an open-world action game that parodies 8-bit and 16-bit eras. It was officially released on PSP via PlayStation Store (as a digital title) and later on PS Vita.