The requirement to set a maximum, limited to 255, seems flawed for larger games, even if they are far and few between on itch.io.
For example, Old School RuneScape permits 2000 players per server, and these servers are interconnected to allow the exchanging of messages and trading of goods between them. There'd be no way to attach accurate metadata for that type of game on itch.io.
It would be more appropriate to be able to set "1 or more players" for games where the limit is either unclear (e.g. you don't know how many players it takes to break the server) or high enough that it isn't impactful (e.g. your game may support LAN parties of up to 2^16 players, but no-one is at risk of hitting the limit).
Additionally, I'm unsure on the use case for being able to set the minimum player count as 0. Maybe if it plays itself, like an attract mode?
In any case, for local multiplayer games in particular that are likely to only support 2, 4 players (additional thought: a game might not support 3 players, e.g. if it requires two teams of 2, but a range doesn't let you express that) I can see this being useful for people browsing the catalogue.