Awesome old school fps in the style of Quake 1. I don't really get the quite low review score.
Only downsides I see is weapon balancing is a bit weird, like the alt fire of the shotgun is so op, but the rocket launcher is way too weak. Levels are huge, maybe a bit too big sometimes. Even though they are never empty, they are always great designed, with great rewards for exploring. A bit annoying is that you unlock highest difficulty by playing through the game once "forcing" achievement hunters to play through it twice. While I really enjoyed my first run, my second run was not needed from my side, got a bit boring.

Very slight thumbs up. The game is fine. Good array of weapons, punchy combat, solid sound design, mostly good looking levels. But personally I only find it enjoyable in short bursts. The problem is pacing and variety. Whenever I boot this up I have a decent time with it but after 30 to 60 minutes my enthusiasm starts to decrease until I turn it off and maybe start it up again a week later.

Most combat scenarios play out the exact same way, enemies are kinda randomly placed or spawned in, not much thought was put into what would be interesting compositions. Doesn't hold a candle to the FPS classics of yesteryear.

But apart from that, nothing about it is particularily bad or terrible. So yeah, slightly recommended I guess if you want a non-terrible FPS.

It's good when the limited quicksaves are turned off.

While the weapons are perfect, the levels that take an hour or so to complete test my patience.

This is a lukewarm recommendation.