As above how do you delete unwanted apps and games from iCloud?

There is no need to delete apps from iCloud. They don't take up your storage space, other that what they need for the backup (just their data, not the app itself). And you'll eliminate that by either deleting the app, or going into your iCloud storage settings and turning off backup for that app.

Or put another way, your apps are not in iCloud, not the way you are thinking. They are just a list of apps that you have purchased with a little tag that remembers whether you've currently got them on the iPad, or not.