this image makes me think of mystery ...

It looks like a horror game with a small child as the protagonist.  No clue what the title could mean.

Button Cupcake, I'd think of something about anime because of a fox/bear heard and sewed ears, button eyes, maybe about a tea-party (like at alice in wonderland? just with this protagonist of your banner than a rabbit), maybe also about something with sewing patterns somehow.

Background could refer to bit action-based scenes because of darkred, bit in black or more dark opacity. Roundy than squared or sharp font, seem to be quote smooth while "butterfly" seems similar to that timetravel-movie / inspired by "butterfly room" as horror movie?

No shadows in the banner, which let me guess that movie being rather in 2d than 3d. Why in graphics: that stuffie's head sounds like it's based on it than the texttitle that refer to butterflies or tea I guess? Maybe it's like five-night-at-freddys where a bear is approx one of the characters too. Maybe it's a bear as bartender or a koala who got a makeover for his fur who serves some tea ...so basically more reference o restaurant and cooking than animals or insects?

uhm, that rose ...could be like a tattoo, maybe referring to specific "tribe" not quite indian just as tattoo that defines enemies or "the good ones", by its mouth I'd think of kawaii-typed graphics in-game.

btw not clicked at the added link or browsing through comments, just by examining the details and my first thoughts even they're just connected within paragraphs and a new line being a completely different version.

I weirdly immediately think of a horror visual novel, something with a darker goth style (the tattoo showing roses but also … tentacles?) The wallpaper background also suggests a gothic atmosphere and the dog (?) head is obviously a stuffed animal (coming to life maybe? I would associate it with the horror movie May). Also, now thinking about it - where does the tattoo come from? Maybe the dog is made partially of skin?

The title immediately reminds me of tea parties and “Butterfly Tea” - with all the other aspects of the image - a sense of danger, maybe it’s poisonous? 

Definitely gives me horror vibes due to the color and distortion of the background, x's on the eyes and liquid-like font. The roses also remind me of the horror anime The Promised Neverland, which has a similar gentleness mixed with horror to it.

In terms of genre my guess would be either visual novel or top-down RPG.

I'd say it looks like the cover of a gothic/ horror visual novel or some sort of point-and-click-story? The title could be an allusion to the tea scene in "Alice in Wonderland" mixed with the "butterfly effect" - nothing in the story will stay the same, the players/ viewers can change the course of the story with their respective decisions.  
Hope that helps. Now I'm really curious what it's all about! :D

Definitely creepy horror, like a "fancier" style of Five nights at Freddy's haha. Gameplay-wise, I dont know why but it makes me think of a 2d style point and click horror game like Fran Bow. Atmosphere-wise, I think of that fairy tale section in Witcher 3 : Blood and Wine, but even more twisted and dark.

Man, I went all over the place with this XD. But, I hope it helped.