Thanks, I ate it all by myself :)
(in two meals, this is a huge portion)

The game is much older than 2012 though.

Yes, it's a PC game. I just realized the hearts make this look rather console-ish, it doesn't look like this in the game so the hearts are artistic free license but they illustrate the function of the building to some degree.

Awesome!

How about THIS?

Thanks, I was pretty sure Fate of Atlantis would be one of the guesses so I tried to add a hint in the file name, not referring to the RPG genre or platform (Secret of Mana is an SNES game) but in terms of the building's function in the game. Now it should be much easier :)

To summarize:

-PC game
-not on GOG
-much older than 2012
-file name refers to the building's function

Don´t tell me you have seen strange lights on the road and now you feel an urge to make those vegetable artworks just to realise you have to go to a temple somewhere to meet our relatives from the stars :P

Yes but it was sort of the other way around, I first had a vision of a temple with a giant radish on top of it and after I saw a Mexican guy with a tattoo depicting the same Radish temple, I realized I had to go there but then decided to recreate the temple in my house with the resources available to save myself the long and arduous trip to Chicken Pizza. I can't remember very much in detail, it was all so fuzzy. All I knew is that I had to cut the hearts from the Father Radish, the Son Radish and the Holy Spirit Radish as a sacrifice.
I actually made this in 2012 and I wouldn't have taken any photos had not a teenager and an old guy with white hair showed up and told me that it's paramount I take 3 photos, for what purpose they didn't say.

Good thing there weren´t mashed potatoes that day ;P

Though no idea about the game.

Black and White?

It's a 2D game with isometric perspective and just a teeny bit older than Black & White

New summary of hints:

-PC game
-2D graphics with isometric perspective
-not on GOG
-older than Black & White by just a bit
-file name "secret of mana" refers to the building's function in the game

I think I know it, but I can't remember the name, but Age of Empires II keeps coming to mind, though I know that's not it.

It's kind of a forgotten game which is why I added enough hints that one can find it by simply using Google even if one doesn't know the game, especially now with all the hints it should be much less difficult.

Not AoE II (Conquerors) but that's so far the closest guess, you're definitely on the right track.

Cook and Guess the Game?

Dammit, I won't be able to make dinner now without wondering how to make it look like Wizardry.

If you identify this game, you can go and crosshatch the Dark Savant on a pancake or whatever you wish!

Populos? I think there was a temple like this - just not as nicely made out of food.

Is it perhaps Theocracy? It was posted by someone a couple of months ago in the "What is this game thread". There are aztec like temples that look like your food pyramid and their purpose as far as I know is to generate mana

Warlords Battlecry? It looks delicious, by the way.
Edit: I just realised these games are on GOG. I'm a little slow.