This fan game is great, never before have physics felt so good in a 3D Sonic game and that includes the official games.
It's just a shame that it's only four levels long (four incredibly fun and huge stages mind you), feels like a demo rather than something that's fully fleshed out.

The only things I didn't really like were the final boss which was annoying and the homing attack which felt rather finnicky at times, especially when locking onto enemies.