Some features I'd love to see on GG.deals:

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Separate tag for bundles of games

When you select 'pack' as a filter it puts special editions of games (which come with DLC, soundtracks, etc) in with bundles which offer a collection of games.

Is it possible to separate these into two categories? I understand this might be an undertaking, but currently there seems to be no way to search for bundles. You have to look for them in between thousands of special/deluxe/complete editions of games, some of which have a dozen versions per title. It would make looking for bundle offers so much easier.
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Custom wishlists

The ability to create custom wishlists would be very helpful. Especially with large wishlists it would be nice to have lists for, say, priority purchases, deep sales, games with anti-cheat/added DRMs, already owned games you may wish to purchase again for friends, games in certain genres, etc.

While some options are covered by existing filters, they can never be as granular as personalized lists. Even a limited number of customizable lists would go a long way. And they might cut down on having to add increasingly specific tags.

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Option to not display 'free' in historical low sitewide

While some users might get something out of it, I don't find it that helpful to know something has been free in the past. That's an edge case that occurs once or twice in a game's lifetime and doesn't help me determine the lower limit it's being sold for the other 99.9% of the time. The ability to toggle it on or off as a profile setting would be much more useful to me.

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Filter stores by payment method

It would be nice to be able to filter stores by the payment methods they offer. This would eliminate having to make mental lists of stores that don't support a preferred payment method, and it could get rid of guesswork when a new store is added to GG.deals.

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Include How Long to Beat information for all versions of a game

Currently only the standard edition of a game displays HLTB information. This makes it so you have to navigate back to the standard edition whenever you want to see HLTB information. It would be good to have this on any page.

I understand it makes sense to not show this for versions that include content which increases the length of a game. But it's also for editions that only have extras that don't increase playtime, like game soundtracks or artwork. You could show an umbrella disclaimer on all pages saying it only covers the base edition of a game.

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Include release date and How Long to Beat information on mouse-over panel

Including this in the dynamic sidebar makes it easier to see information at a glance without having to navigate to the product page.

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Sort by Closest to Alert Price

It would be useful to be able to sort games by closest to the price you set as an alert.