I used to work at Cash Generator listing items online, and old games like this came up a lot. The code of practise (at least for the particular store I worked in) we had was to look up on Ebay what the items sold for and then just list them for the most common price that occured, because we'd buy them in cheap and when most of the sales were like £5, the £20 completed sales were usually considered outliers. Using that method, I'd list all of these for;
B.O.B ~ Somewhere between
£5 and £13Bubsy ~
£7Donkey Kong Country ~
£15Killer Instinct ~ probably somewhere around
£8Lemmings 2 ~
£7Mickey Mania ~ maybe like
£5? hard to judge because a lot of these are boxed by the looks of it
Mortal Kombat ~ most of them look like Ultimate Mortal Kombat so i dunno maybe
£5? again not a lot of completed sales for cart only
Super Mario All-Stars + Super Mario World ~ looking like a decent
£17 or so for this one
Super Metroid ~ probably the best of the haul you've got, i'd probably have listed it for somewhere between
£30-£40Time Slip ~ on it's own, cart only, you're looking at maybe
£3 at best.
You'd probably be looking at like... £107 if they all sell for roughly the prices I've listed? But obviously there's no guarantees in life so who knows.
I've linked all of the completed sales search pages in the price so you can have a look yourself if for whatever reason you think I'm trying to bump you. Take no notice of the red ones, it means the sale didn't go through so they're literally worthless to your search. Also try to take note of whether the items listed come boxed or not, that makes a huge difference in price.
But yeah that's just the guideline of how I would've done it at Cash Gen. obviously it's up to you how you decide to price them and stuff.
Hope I could help, good luck~