for a idle game, this has a very deep mechanic.
producers produces essences.
storers stores those essences.
converters changes those essences to that creature's unique energy.
buffers enhances the abilities of the 3 above.
the unique energy have 3 usage.
1. to upgrade the stars of their respective creatures.
2. to unlock hidden creatures.
3. handed in for requests.
collecting those unique energies will also net you echoes.
these are used to unlock the table and to upgrade the creature's card after it reaches 3 stars so duplicate cards will have the same upgrades
fulfilling requests gives you masteries. these are used to boost the strength of the abilities.
higher tier creatures have higher essence output so the converter's storage must meet that output to produce that unique energy. to do that, converters must pair up with storages to boost their own storage.
to pair up 2 cards, you must match the icons on the border.
there are 4 symbols. fire, leaves, gear and orb.
if the icons doesn't match, you can use echo to reroll them.
unlocking the stars will unlock increasingly lewd pics of the creature. after that, you can the picture you want on the table. each creature have 4 pics. default, nude, lewd and explicit.
imprint allows you to replace that picture with another you already owned.
the merchant will sell you gems that improves the abilities of the cards. each card types have their own gem.
originally, i thought this game is rather expensive for a idle game but, there are 72 creatures in the game. each of them have 4 pictures. that's a lot. i don't know how much of it was made by ai but i feel that much artworks makes the pricing worth it.
the music is also soothing to the ears.

Fine game. You create simple production chains out of 4 types of girl cards - producer, convertor, booster, storage. Producer generates essences and has small essence capacity. Storage has large essence capacity but doesn't generate essences. Convertor converts essences from producers and storages around it into elements. Booster just improves production speed and size of storage of connected cards. Each card except for convertors and some final cards is related to one unique element and you use few of those elements to upgrade them twice and unlock new cards. So the whole game is about building a chain, tiering up a card twice, unlocking new card, switching a chain to produce a new element.

It seems there was some time gate in the game as when tiering up you can see a requirement of a scroll which you can only buy rarely from a trader but in this version of the game this requirement is ignored so you only need produced elements and thus the game can be 100% completed in about 4-5 hours.

Some achievements trigger on starting the game and pressing continue to load the previous save, specifically the one which require a certain amount of unlocked pictures.

I was hoping this would be a game where you'd combine monster girls to generate new ones from their genetics like in the sims, but the girls are set and have fixed unlocked costs and paths.

There are also no lewd animations in this game, just art. There's not more that the trailer isn't telling you.