The game received its last demo with this update.
Full Demo Content/Changelog:

24 Hscenes.
40000+ Words

Translations:
English—Default Language
French
German
Japanese
Korean
Portugal
Russian
Chinese
Spanish
Italian

Performence improvements.
Player stat increased.
Required leveling exp reduced.
You can skip text now using ctrl.
Writing correction.
Bug fixes.

Hi everybody, I just want to share that recently I launched a small project, which is already complete and released.

This is a small game. I made it to learn and test the engine, which I will use for my future works.

If you would like to try it out, the game has a free demo.

The game is not perfect, but I hope you will find it enjoyable.

Here is the description of the game.

https://store.steampowered.com/app/3277560/Succubus_Challenge
Do you want a more difficult fight or an easier one? You have the option to choose the difficulty level for each battle.
In each turn, your succubus opponent will carry out a sexual attack on you; to win, you must fight and beat the demon by using the unholy trinity of headpat, handhold, and kissing.
Perhaps you need a little additional assistance before the battle? Interact with the succubus girl and gain a buff that will greatly help you during the fight.
After a victory, you will be granted a score, which is needed for content and unlocking progression; the more you win, the more sexual scenes you can see.