Much like 16-bit triple trouble (or I guess the other way around since this released first), this isn't really a sonic CD fangame, it's a 3&K fangame with CD elements.

The level design is unfortunately quite weak, with a lot of dead air and straight lines with nothing going on.

What this game really excels in is its looks and especially its music, I love all the level themes and their respective tracks, and seeing them in the past and future is always incredibly fun!

I also quite enjoy the special stages in this one, they're very fun! But like others mentioned, 14 is quite a lot.

Still, this is a very good fangame, I'd recommend others play it!