April Fools can actually be pretty tiresome, you get a few good gags but a lot of stuff that isn't funny or worse - looks good but is never happening.

This falls under the much rarer category of looks good and actually happened.

Judging this game against other VN murder mysteries is fairly pointless, it's not as deep or as clever as any of the good ones but for it's run time (a couple of hours) it has a fun plot to follow, decent writing and a clever mechanic to keep it away from just clicking through text.

This mechanic [protagonist/you] Dream Gear is a little auto runner with Sonic that is used to represent the lead coming to conclusions. It's a good idea and gives it a positive comparison to games like Danganronpa.
The issue is, the game is kind of crap.

It's completely serviceable and there is more variety to it that it really needs but it simply does the job.
A potentially unfair complaint I have is it doesn't feel like a Sonic, I'm surprised and oddly sad that for once they didn't just re-use Green Hill again. Pieces of that or just mini zones would have been much better and a cooler celebration of Sonic but that could be expecting too much.

At the end of it all, this leans on the side of actually good and worth the couple of hours if you have any love for Sonic and/or crime VNs.
It's all quite basic in game play but the art is nice and the music in places is truly class.
Best of all, it's free.