FDA for Damned Legion. Dies a lot, doesn't complete.
I liked it, although I had several issues with it.
Playing pacifist for the first few minutes turns every fight up to that point into a joke. There isn't really anything obstructing your way, all you need to do is hug the imps and move along. Making it harder to squeeze through silently (i.e. more imps) or simply waking the monsters right away (i.e. shootable switch right at the start) could take care of that.
Additionally, the archvile trap near the plasma gun can be made fairly easier by staying at the edge and activating the switch from the upper floor. Not sure if that's worth changing, this little ambush feels hard enough regardless.
In the next room, the number of cybies coupled with their position, the relative lack of ammo, the small room in which you have complete safety and the crusher makes activating the crusher and just hiding out until they're dead a very appealing strategy, which isn't too interesting. I'd say removing the crusher or making its trigger much closer to the cybies, along with adding plasma ammo on the top floor and possibly removing a few cybies would go a long way towards making this more fun.
Beyond that, things were all good, save for one thing: I have to echo danne, this really needs more ammo. At times it felt like I was punished for not having already perfect knowledge of the map - i.e. against mancubuses when I wasted much of my ammo on them only to trigger cyberdemons right behind, right after.
I assume I got to the final fight, and, yeah, I think I had all of 200 or 400 cells to deal with that gigantic horde including cybies and archviles, so after playing "match the projectiles" with revenants and hellknights for what seemed like a dozen minutes I ran around more aggressively and quickly died. At which point I gave up, because I know unless I crack open DB2 or play with saves, I'll never figure this fight "the right way".
The map was also especially dark. I first raised gamma level to 2, then for that final fight it still seemed super dark so I went to 3. Probably should have just played the whole thing on gamma level 4, seeing how tight it was on ammo, but I was reluctant to do so - which, in the end, is a good thing, meaning I liked the looks and atmosphere enough to not want to ruin it right away. ;)