Hello and thank you for your interest!
I feel like other similar games on Itch are about as self-descriptive, if not much less so, and I think the screenshots provided make the game's premise fairly clear: this is a text adventure that is not solely smut. What I definitely haven't made clear is that most major Sonic characters can be recruited as a party member, and will be possible romantic and sexual partners through building up Relationship Values or getting into hijinks together (though at this stage in the game's development this is not yet possible.)
The second screenshot shows the current state of combat, which is not fully finished but is basic turn-based RPG combat. States (status effects) will be implemented, but are not currently in.
There will likely be limited transformative options for the player character such as alterations to the size of their privates, but not changes to sex or race post-creation.