Regarding Metamor Jupiter, while the "mode-7" effect is impressive, it's actually just a line scrolling effect & doesn't seem to manipulate the bg layer in 3D. You can tell by how the top & bottom of the "tube" don't seem closer to you. Compare it to Super Castlevania IV, and possibly Ranger-X. Anyone care to prove me wrong?
It's more than just line scrolling. It's compressing the BG layer at the top and bottom; hsync Y repositioning to scale the BG layer vertically in those parts. The X offset per line is to give the illusion that it's round. The PCE doesn't have two BG layers, so it's also updating BG color #0 on a per scanline basis to give it constant shading regardless of the rotation (light source if you will).
Ranger X is
just line scrolling (tunnel part). There's a way to do the CV4 tunnel effect on the PCE (I did wrote a demo once to show it off), but it doesn't leave a lot of room for detail. The shading at the depth part is decent, but not as good as CV4 (16 subpalettes for the BG works great for this, but the PCE master palette is the limiting part).
^- @ 27:04 the fake BG layer with transparency (dynamic tiles).
Also, Night Creatures holds the record on PCE/TG16 for largest dynamic tile area per frame. It does a 128x128 pixel block of the back ground to simulate a parallax area of the BG - all with dynamic tiles.
Psychic Storm uses 60hz color flashing on the last ship to get more shades of red.