1 more thing to add itch.io has uploaded games dating back 10+ years. Most versions of unity around that era could compile for Windows XP still. I remember even AAA games as late as Skyrim supported XP. AAA games still support windows 10 now. Time doesn't move as fast as people think.
Viewing post in System requirements
Rpg maker Games : 1.5gb To 4gb Ram
Shitthy Horror Games : 1gb To 2gb ram
Visual Novel: Same As Shitthy Horror Games
Palformar: 3gb ram
Shooter : Rare Expection 8gb ram [ Overkill the Game ] but Most 4gb Ram
Graphics : Rpg maker [ If You Pc Can Handle Final Fantasy 1-6 Pixel REMSTER You Are Good To Go
Shitthy Horror Games : Pc Can Handle Sonic Adventre 2 You Are Good To go
Visual Novel : Not Much Graphics Card Power Needed
Plaformar : Same As Rpg maker
Shooter : Ranged