Hello all, just made an account to find the name of an old game I have been searching for for quite a while. You all seem to be a smart and helpful bunch, so hopefully you can assist me completing this, my seemingly eternal quest.
The game in question was installed on a Windows 95 PC and I think didn't actually require a disk to play it (it was pre-installed/ready-to-play on the machine), but may have been on one at some point. The game I think was a sci-fi/space first-person shooter game, and I think I remember being guided along a possibly-protected path (mentioned later) by a female (computer?) voice through the level that I remember (perhaps a tutorial level?).
For the level I think the player starts off guided and without any weapons initially, being introduced to gameplay/story elements and especially the enemies (akin to Halo CE). I think the level took place outside on a orange/red-coloured planet surface (mars or hell possibly? - kind of like Doom) and the player is guided along a path where he can observe enemies (with relative safety) from behind transparent/invisible shield walls or glass on either sides (like an aquarium viewing tunnel), safe from enemies getting through and projectile damage.
I believe the enemies were aliens or demons (similar looking to Doom/Duke Nukem 3D base enemies in my head) and that they were in battle with each other or (more likely) human soldiers on the planet surface (humans likely were inevitably slaughtered). Furthermore I believe I recall that the player could interfere by walking through the shields/glass out into the battlefield (with the female voice perhaps warning you not to or telling you off for doing so), but the enemies were very dangerous/quick to kill, possibly because you may have not been able to defend yourself without a weapon of your own.
That's about all I remember from the game, but feel free to give suggestions and ask me questions if you can. Thank you all and good luck with the search! All help will be much appreciated.