Trojan (or Tatakai no Banka as it's called here: Capcom Arcade Stadium only includes the Japanese version of the game for some esoteric reason) is one of the games that signaled Capcom's imminent breakthrough on the way of making great arcade games. It's still very much a work in progress, and completely unfair and unfun, though it starts very promising.
You're a weird sword-and-shield wielding dude battling eccentric enemies straight out of Hokuto no Ken in a post-apocalyptic setting. The first level is actually pretty awesome: the setting looks amazing and is rich with detail, and the music is alright. The gameplay is simple side-scrolling "whack 'em up" fare, though you get a questionably useful shield to block projectiles. Enemies are of a few varieties and they start off simple enough to deal with. You fight a mini boss and then a boss, then you get to the next level, which is less striking visually, but equally fun, though the boss is a bit hectic and tries to sucker punch you out of nowhere.
From level 3 onwards, the game quickly becomes unplayable, with infinitely spawning baddies in tight corridors, assaulting you with an onslaught of projectiles and respawning instantly, making it frankly impossible not to take damage multiple times. The game also starts introducing some minibosses and bosses (later, two at once) that have enormous reach and lash at you randomly and erratically, depleting your health in milliseconds and leaving it up to chance if you're even able to damage them through their blocks or not. Even with the rewind function, they required multiple savescummy attempts to bring down, and that's with me getting there with full health by continually rewinding each unfair preceding encounter.
It keeps going on like this through 3 extremely boring-looking levels, with a final stage that at least is visually interesting again, though by that point you're constantly rewinding through an unholy barrage of crack-snorting enemies and hails of projectiles.
Tatakai no Banka shows signs of slowly inching towards richer and more appealing arcade games, even if it wasn't quite there yet (and in my eyes is a giant step backwards from Ghosts 'n Goblins, by far the most "modern" and ironically most fair Capcom game from the era). As it is, it's basically a broken game after the first two levels, but it's quite the step forwards aesthetically.