What do you mean by room to spare? as some games are bloody huge.
Yep and they’re getting worse. I have a 480gb NVMe as an OS drive and it didn’t take long for space to be taken and I don’t have many games on there...
Are you with the latest 1709 version (Fall Creators Update)? If not, update your W10, and then clean up the SSD. You will have maybe up to 25GB cleaned.
Also, clean up the MS Office updates, it's the best to switch them off completely.
I was planning on using it only as a boot drive and using a 1TB drive for games
Any 128GB SSD will be fine for windows 10 and hundreds of apps.
Think that goes without saying. HaDepends how big the apps are, if they are just little utilities, then probably, but not hundreds of full fat premium apps. Not even close.