Peak concurrent users in a day topped out around 10 on Steam (it's a niche game). Other stats: there's about 40 people on the Discord and there are 27 reviews on Steam. That's as a free game--I assume the numbers would have been lower (probably much lower) if it cost actual money.
As far as monetization on Steam, what are you getting at? DLC? I'll admit to not knowing (mostly as a player and, more recently, as a developer) of any other way to spend money on games besides buying them or DLC on Steam. Edit: I'm ignoring "free to play" since I don't like that model (as a player or developer).
Edit: Wow, looks like the median indie game makes barely $1k: https://howtomarketagame.com/2023/04/25/what-if-steam-didnt-...