The Genesis has numerous games with outstanding use of parallax. A few examples:
Greendog has quite a nice-looking underwater level: https://youtu.be/VL7jR1NN4p0?t=837
Thunder Force 4 has a pretty mind-blowing first level over a lake. I think there's something like 16 layers here?: https://youtu.be/EmO8WGx1hcE?t=80
Toejam & Earl 2 has the flower meadow level: https://youtu.be/CbwSmKex_qY?t=2781
Adventures of Batman & Robin has this cool 3D effect in some of its levels: https://youtu.be/CR0MWpOK1RU?t=2637
Greendog has quite a nice-looking underwater level: https://youtu.be/VL7jR1NN4p0?t=837
Thunder Force 4 has a pretty mind-blowing first level over a lake. I think there's something like 16 layers here?: https://youtu.be/EmO8WGx1hcE?t=80
Toejam & Earl 2 has the flower meadow level: https://youtu.be/CbwSmKex_qY?t=2781
Adventures of Batman & Robin has this cool 3D effect in some of its levels: https://youtu.be/CR0MWpOK1RU?t=2637