BLOOD is an absolute classic in 2.5D shooters - punchy firefights, intricate levels, all drenched with a gothic theme and amazing sound direction - but until recently your only real option was to play it through Dosbox. Not an experience I'd recommend. The music doesn't even loop, mouselook is weird, have to dive into a console just to adjust window size or keybinds, like viewing a masterpiece through a kaleidoscope.
Fresh Supply updates BLOOD on a purely technical level. There are no alterations to the core movement, levels or firefights, it's fully compatible with most of the most notable mods on the market (Death Wish, always worth playing). If you've played through BLOOD before, this is a fantastic reason to replay and comes bundled with the DLC, and if you haven't, this is a fantastic way to experience it for the first time.
BLOOD gets movement and shooting right on a level that no other 2.5D shooter does, or 3D either for that matter. The movement speed is just perfect for the level length, the jumping physics are bouncy and cathartic, the TTK is perfect for most enemies, every weapon feels meaty and useful. The roster has no real bloat and is used in every way it can be.
Most levels leverage the best of 2.5D retro shooter attitudes - real life places used in weird ways. Combine with excellent sound and it's one of the best the genre has to offer, and accrued a cult following for a good reason.
Course, it's not a PERFECT game. Has some issues that will probably itch you the more you play it. Can't go far without someone bringing up the merciless hitscan base enemies (hint: duck or go fast and their accuracy automatically drops). Couple of semi-infrequent enemy types are just no fun to fight, gargoyles and dogs. Lot of the mid-game levels are just boring industrial filler.
And the port itself isn't perfect either - had some launch issues that needed some patching, and now that Warner Bros has gotten all weird over the license there's some slight remaining issues are never going to be addressed. Nothing major, thankfully.
It's a game worth gushing over, and it's still slightly amazing that a sourceport ever happened after decades of suffering through Dosbox replays. I'd recommend this to just about anyone with a love of shooters or gothic horror.
And look up a fan-commissioned soundtrack remake on Youtube, if you're in the mood for more, it came out great. That and the mods.