According to my rom directory, the full list of 8 mb games ist:
1941
Aldynes
Bomberman 94
Bonk 3
Daimakaimura
Darius Plus
Detana Twinbee
F1 Circus 92
Fire Pro Wrestling 3
Lady Sword
Parodius Da
Populous
Power League
Momotarou Densetsu
Neutopia 2
Quiz Takou Shashin
Raiden
Strip Fighter 2
Super Momotarou Densetsu 2
TV Sports Basketball
Twinbee is not an 8meg game. The rom dump is, but it's actually a 6meg game.
Interesting if it's wrong. Why would the .pce files be different than the actual game roms...?
Over dumps. So you don't have to handle different rom mirroring layouts on flash carts and emulation. But at the expense of a larger rom.
OP: If you looking for games that have particular instances where it does something unique or 'pushes' the system, rather than a game as a whole - I could list some stuffs.
TwinBee hucard - later stages uses quite a bit of sprites to do parallax. One part has a three layers as a result.
Metamor Jupiter - the cannon barrel part. Not just hsync Y-scaling and X offset, but BG color #0 trick to add to the illusion. There's also a part where it has good dynamic tiles for a fake BG layer.
Magical Chase - Good use of dynamic tiles, sprites and hsync interrupts to give more depth to 'scrolls'. First level uses the rarer BG color #0 trick. The trick is only used by a few games.
Gradius 2 - Not really pushing the system per se, but the overall presentation is top tier package. And the fact that they managed to get the game running with almost no slowdown (Konami are great game designers, but not exactly great 'coders'. Even their dual 68k arcade board of the same game slows down). The dynamic tiles in to the two different stages were nice as well.
Ninja Spirit - Only one real part is impressive and I've only seen it done once; dynamic tiles on a split bitplane level. The leaves of the trees on the second level are bit plan 2/3, and the dynamic tiles are on bitplane 0/1. They use a special palette so that you don't see the leaves changing colors, but the BG layer scrolling underneath them. But they could have just as well made this a transparency effect with scrolls. I don't know of any other game that does this, other than my TF4 PCE demo.