You are welcome to use the assets in your game as you wish, any credit is optional.
Viewing post in Retro PSX Style Mansion Assets - Demo comments
"LICENCE: This asset pack can be used in both free and commercial projects. You can modify it to suit your own needs. You may not redistribute or resell it."
It's unclear to me what exactly can be done with this. If a Creative Commons license were listed that would clear up what can be done with them.