I have completed the beta. It's okay.
Current state of the game, based on the beta, is:
It's buggy. Certain difficulties make the game actually impossible, like Cyberspace 3 kills you every time you leave cyberspace (It's not supposed to), which is impossible to complete the game as a result. Puzzle 3 crashes the game entirely every time you do a wire puzzle. Lots of people reporting they fall through the map when doing level transitions. I had the game lock up every time I tried to transition to the final level until I got lucky and it worked once, can't replicate how though. Cyberspace powerups don't work and you lose them all on leaving every time, making it impossible to pass under certain circumstances. They've been informed of these and have been fixing them, we've had one patch so far.
It's unfinished. No big surprise there, but there's some pretty big omissions like an entire cyberspace section with no enemies, and what I hope is a placeholder final cyberspace segment because if they take that to the final release it'll be a fucking shitshow, it's utter garbage. Some augments don't work, some models are unfinished.
It needs balance work. Some enemies that should be really tough and dangerous are pushovers, meanwhile a common security-1 bot is the most dangerous thing in the game because it'll hit you the moment a pixel of your body is visible to it. Melee feels weightless and bad.
All that said, it's an okay adaptation. They changed a few things here or there but none of it is really offensive (except the groves, where they paved paradise), and it generally makes sense. The guns are done well and are meaty and for the most part each has a clear role in the arsenal with little overlap. The first two thirds of the game are good and enjoyable, most of the last third is good with a few issues like the empty cyberspace segment, then the last cyberspace segment is so bad it retroactively soured it for me. They really need to change it.
It's a beta, and it's clearly a beta-beta and not a "finished-product-that-we-call-a-beta". If they take the time to finish it properly it can come good. If they push it out the door in a couple of weeks to meet some release target, it'll stay forever rough.