Box Cutta
Bumbling Sidekick
Personal fave.
The "actual game elements" are solid enough, enemies, bosses, and puzzles add enough challenge without being particularly annoying. Standard survival horror fare in that regard.
But where this game REALLY shines is in the areas where *most* videogames horrendously fail. Most videogames, although fun, are actually vapid, immature, worthless piles of garbage under the thin crust. That simply is not the case with SH2. The imagery, characterization, story, themes, plot...it all fits together so well. And it's actually DEEP. This is one of the few games worth theorizing about and contemplating on well after you've completed it.
It's also one of the few games with multiple endings where I felt that the various endings (Outside of the fan-service, jokey UFO ending) actually MEANT something.