I need help determining the value of my collection

Well, any MSX games you have are priceless if you love MSX. So keep them
I can play all those games already so If I had to pay you wouldn't get much. But every person is different. I wouldn't sell my Salamander or change it for your complete list even if there is another one on it, cause it's MY Salamander So... prices are relative.

Doesn’t answer my question. I’m looking for the rough market value of each of my games.

Price of vintage games are fully relative to buyers.
From a gaming point of view, these games are not worth more than 5€ (if you compare them to games you can find on PC for example).
It is the nostalgia or the pleasure of collecting that will make the prices potentially very high.
For example, I could put 100€ in a King's Valley II which is my favorite MSX 2 game while I will never put more than 20/30€ in other games which are however much more wanted (like a Metal Gear or Castelvania).
Evaluating your collection is therefore meaningless in absolute terms. ¯\_(ツ)_/¯

Many titles have a kaitori ("purchase") page on suruga-ya which may be some kind of minimum price for a complete item in good condition. I believe this is the price suruga-ya offers to those selling their copies to the shop, though I never sold there. Those prices are always less than what suruga-ya charges for the item of course, but may help build a "liquidation estimate". I think value here is dependent on what purpose you'll use the figure for too. Insurance has very different criteria for value than you might choose if you are establishing auction reserves you might pick if you need to liquidate the collection to meet some other more essential need. If you want to trade parts of the collection with parts of someone else's collection on an equal-value basis "market value" might be far less relevant than the value of the items in the eyes of your trading partner

I like to know what my stuff is worth. I'm interested in that sort of thing.