what do you mean by lacks content? there are almost 50 unique events with art at this point.
Relatively speaking there is a lot of content considering it's a game by a single developer done as a passion project.
But in an absolute sense there is only a small amount of content. The queen is the only character with a good amount of ero content and there is no customization for her nor much choice in terms of being submissive or dominant, decadent or diligent, doing things herself or letting others do them.
In terms of gameplay it's also still rather linear and quite short.
Of course games by actual companies like
KISS - Make Me Lover,
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Alice Soft - Sengoku Rance
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Eushully - Kamidori Alchemy Meister
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are in a whole other league but even other small games here like:
https://f95zone.to/threads/simbro-v2-7b-the-simbro-team.198/
https://f95zone.to/threads/erotical-night-v1-5-e-ohkoku.2362/
feel like they provide quite a bit more than yours. The first one is a sadly abandoned brothel manager where you can hire randomly generated prostitutes (though there also some fixed ones including parodies of popular characters like Zelda and Korra). Thus a huge variety of characters and you also get showered by lots of sex scenes since you run a brothel.
The other one is a RPG where you beat succubi by having sex with them there is a good amount of different girls and since the fighting and fucking are the same thing there is no lack of scenes.
Once you have spent a few hours playing Queen in Deficit you have seen everything, there is no sandbox aspect that let's you hang around where by simply running the Kingdom and walking around you'd have plenty of chances for ero-content like corruption events to occur and since the different paths are still in their infancy you have very little replayability there either.