less than a thousand concurrent players normally
and heavily underrated
every fucking time somebody mentions underrated games Phighting is brought up (and I’m lowkey sick of it)
it’s not heavily underrated 
it is, you’re just in circles that know what phighting is
attention-bringing gem
Surprised that I never brought it up or replied, but Merc Fleet by Team Thaumaturgy is stupidly fun if you like fast-paced shooters. It’s so fast that it has a built-in aim assist, but it can be turned off.
Major issue is the player count being so small. If you stay in one server long enough, which is roughly 45 minutes in my experience, you will be the last one keeping the server up. Grab some friends if you have any and want to play.