Fun VN, if a bit too grindy and repetitive at times. I do think the AI images could use with a tad bit of culling/editing as there's a decent amount of artifacts/weirdness to them. Granted I know that process can be pretty annoying. Writing-wise I can tell you're going for something like Hornycraft, like you said in a previous comment.
The one thing that's kinda strange is that all of the sex scenes are basically HMOFA, even down to the scaling looking like the POV is a physically larger subject than the sonic girls.
Don't get me wrong, I like that in a way, but it's still leaves a very weird feeling like you're trying to have your cake and eat it too with the MC inhabiting Sonic body, and that seems heavily reinforced with the writing and that Amy date CG.
I suppose I wish there was an option at the start to choose whether you have Sonic's body, or if you're just a dude who inherited his powerset and name. Writing-wise it'd be a lot of work, but it'd be an interesting option perhaps.