This would probably the next best solution for dealing with duplicates. Do all the duplicates have the same title? Maybe you could try merging them based on identical metadata.
Also, I think filtering based on genre and other attributes is crucial for browsing a big list like this.
You could maybe also add in-store links that would open the game in the Store app?
The duplicates unfortunately don’t have identical titles. They’re close and I think I could do some matching, but it will be something like “Cool Game” and “Cool Game - Windows Edition”. Except that subtext isn’t the same for everything.
I've noticed that about the duplicates. Some cleaning up will be necessary like removing the TM symbols, yeah. Is there no other metadata you have access to?
edit: Where did you get the store IDs for all the games anyway? Also, those titles are weirdly inconsistent, which is annoying.