In this state i can not recommend it.

It lacks very basic usability like being able to change settings during play.

I played through a few uninspired looking areas with basic floating robot enemies with a basic pew pew weapon and weak gunplay.

Sweet and short archaic shooter in creepy underground bunkers.
Since it is free, feel free to give it a try. It is a bit janky but if you look at this and like it, you will be fine with that as well i think.

The trailer however is a bit misleading, it makes it looks like a lot more run and gun than it is. Last 30% of the trailer is multiplayer and if you don't bring your friends, there wont by any multiplayer. The singleplayer part is more methodical than what is shown in the trailer.