A belated welcome, Grey_duck! Nothing is ever too late!
Let me do a small breakdown of the games in the Winterwolves catalogue. Perhaps this might help you some.
Timeline:
The Aravorn Series (All the fantasy titles that take place in the world in order)
Spirited Heart Deluxe (which you've bought)
Loren Amazon Princess (which you've bought)
Seasons Of The Wolf Deluxe (Male/Female choice protag, RPG)
Heirs And Graces (Otome/Yaoi dating sim)
Queen Of Thieves (which you've bought)
Amber's Magic Shop (which you've bought)
Cursed Lands (Male/Female choice protag, RPG)
(Prequel to Loren's world)
While timeline (except for
Cursed Lands which contains direct events from
Loren) doesn't strictly matter, some references from previous games carry over to the next/latest.
Seasons Of The Wolf Deluxe
This one is certainly the meatiest in terms of content and quality. If you want another Fantasy RPG set in Aravorn, this is an excellent title to get.
Cursed Lands
In a close second, is this RPG. A likely very good package of content and quality (game is still in beta). One thing different is that the game is in first person so you can't see the protagonist, thus stuff like romance CGs work differently (I.E first person type). Not that this huge, but it might matter to some folks.
Heirs And Graces
I think the art-style is gorgeous and jives very well with the setting! It's nice in terms of content and quality, but lighter than the RPGs of course.
Sci-Fi
Planet Stronghold Series (In timeline order)
Planet Stronghold: Colonial Defense (which you've bought)
(Prequel)
Planet Stronghold (Male/Female choice protag, RPG)
Planet Stronghold 2 (Male/Female choice protag, RPG)
(Upcoming later)
Ironically, it's a better idea to play
Planet Stronghold first before
Colonial Defense as the references carry over the other way.
Planet Stronghold
I think it's decent overall in terms of content and quality and of a no less length than the others, but personally, I think it's of a lower bar than
Planet Stronghold: Colonial Defense. Gameplay is direct RPG in style.
Planet Stronghold 2
Not yet released, but it looks like it will not just be a sequel, but a meatier version as well in terms of content and quality. It's also a very direct sequel, so stuff like the romances potentially carry over I think.
Bionic Heart Series (In timeline order)
Bionic Heart (Seinen, dating sim/RPG elements)
Bionic Heart 2 (Multiple Protag, RPG elements)
Bionic Heart 2
By the far, the most packed in terms of content and quality. However, it's different from the former in that it is an intertwined story consisting of several characters intersecting. Cyberpunk world.
Bionic Heart
You might still like this one well. Fixed Protag, with sim/choice elements.
Dating Sims (I will exclude the ones you own to make my long-ass post shorter.
)
Contemporary
Always Remember Me (Prequel, Otome)
Never Forget Me (Sequel, Otome)
Personally,
Never Forget Me is the better done version of the two. However, both are interesting in their own aspects. The first focuses on the "chase", winning back your amnesic partner or trailing off to the arms of someone else. The second focuses on the "marriage/settling down" aspect direct from the prequel, where you can see if you are able to take the challenge of holding down your relationship with your chosen from the prequel.
C14 Dating (Otome)
Highly recommended! If you want another dating sim, this one is next highest in terms of content and quality.
Flower Shop: Summer In Fairbrook (Seinen)
Flower Shop: Winter In Fairbrook (Otome)
A half farming and half dating simulation. Lighter in terms of quality than the others, but you might still like it well.
Fantasy
Heileen 1 (Otome/options)
Heileen 2 (Otome/options)
Heileen 3 (Otome/options)
Heileen 3 is by far, the meatiest in terms of quality and content to the all of the 3. It has it's flaws but still of worth. All the NPCs that you have romance/esque choices with in
Helieen 1 and
2 return back as love interests in the 3rd together with new ones. For continuity, one can adventure into the prequels of 1 and 2.
Helieen 1 is more or less kinetic with some choice variation.
Helieen 2 has a bit of unique game-play elements, and is longer than the first.
Urban Fantasy
Love Bites (Male/Female choice protag)
(Upcoming soon)
I'm looking forward to this one! If you enjoy
Planet Stronghold: Colonial Defense's story style, it's safe to expect good things out of this title, as it's done by the same creative people.
Hope you find my post of some worth in finding the titles you want!