Actually, I created the ships based only on their size; I didn't think about specific classes or roles. They simply get gradually bigger, so they'll be harder for the player to destroy. To add more variety, I designed many ships with different looks—some inspired by the Star Wars saga, which I really like. I didn't think about factions. There's the player and the enemy fleet. But you're free to create classes for each ship size and come up with different factions—you could even turn it into a strategy game.
And it turned out very cool and organic!
Moreover, I found that this whole array of ships is very easy to organize. It's funny, but if each pixel is taken as a 1x1 meter reference point, then the classification of modern naval warships surprisingly falls on your ships (this is, of course, an approximation, since the area is taken into account, not the volume). But this is generally expected, since marine classifications rely on displacement. And if, in addition to this, the size of the engines and types of weapons are taken into account, then ships of different classes and purposes can be very organically distinguished by endurance and power, as well as maneuverability. Surprisingly, the design can affect the game stats of ships :) You can see example bellow:
Well, then I tried to divide the ships into families by design elements (for example, triangular shaped ships) and it also worked, although not so easily. But I managed to do something:
Yes, I also noticed some similarities with Star Wars for some ships (I think I've seen a few TIE-fighters).
That's why I asked if it was some kind of original or if it happened naturally ))) Well, it's just a great job! There are a lot of different ships in your asset pack with a wide variety of sizes and design elements. And this set of ships, it seems to me, covers most of the development needs, not only for a strategy game, but I think also for something big - something big like Space Combat and Trading videogam, for example, like Escape Velocity.