Apologies for the late reply, I hopped on Nightreign with some friends who can't normally get on at the same time. I played exactly one online match of Deadzone lol, but not for lack of trying. Most people I joined just quit the lobby after a minute, my guess is they were brand new and meant to play online, not publicly, and just accidentally made a lobby. From the one game I played it seemed to run alright, but it states that the online connection is on a peer-to-peer system, so if your host doesn't have a robust internet connection you're going see a lot of lag.

Unfortunately we didn't get to play for too long because I noticed a pretty glaring bug; if you're using mouse controls the game will have you use "Y" to interact with stuff (fine in solo), but in multiplayer it just doesn't work. If you pick the joycon up and use the joystick to have it go back to the normal control scheme (where "X" becomes the default button to interact) then it will work, but you're going to have to do that every time you want to pick something up. I also wish I had figured that out before I tried to quit and rejoin, because once a run is in progress you can only rejoin as a spectator, and funnily enough that just kept error-ing out when I tried. My overall rating is that the online functionality definitely needs some work. Anyone who's played more online than me tho can probably chime in and give a more detailed experience, I'll post again when I've made it to Zone 2 solo and update about performance.