Double-checked the potential servers for Islet Online, and it looks like the only one which exists is indeed the standard Steam client:
https://store.steampowered.com/app/428180/Islet_Online/
Testing it for literally ~5 minutes to make sure it works, and it loaded just fine on my PC. Even goes up to 4k if you set fullscreen in the options.
Looks like the main game runs off the "Global Server", but you can apparently make Local Servers if you want once you're out of the tutorial. There's also what looks to be Morrowind-style attribute progression. Jump more to start jumping better, use axes to get better at using axes, etc.

Interestingly, there's also a Creative Mode variant available as DLC for the main game, functioning as you would expect:
https://store.steampowered.com/app/493850/Islet_Online__Creative_Mode/
You can't use your main Islet Online characters in this mode, but you're given maximum stats/resources on everything, since it's just a creative sandbox. Mite b cool as something to spice-up the final few days of the second week.

This could be something special. Or we could get screwed-over by mobage energy mechanics if this game leans too hard into them, since it's pretty clearly a mobile title ported to PC. We'll have to see.

>>1830970
>he doesn't know
Private server populations for older KMMOs are small, Anon. You'll usually see anywhere from 10-200 people for most of them the majority of which tend to be SEA.
300 for a single server is pretty impressive, relatively speaking.