Comments and Bugs:
1. The starfish spinning attack doesn't look very good and it's annoying at the point where you have to take the bubble to go outside if it manages to get near it.
2. The snail enemy face looks like it doesn't fit in a sonic game imo.
3. Most of level design was ok but in the point you get the water shield, if you lose it then you're done for. The level isn't too friendly to the player if he loses the shield.
4. At the start, you don't have to put all the credits there, it kind of ruins the presentation. You can add them at e.g. the opening. and if you keep them add a way to skip them.
5.The main title screen needs a little more animation, logo-wise.
6.BUG? Sometimes after I viewed the controls the game froze for a bit and had to wait a lot for it to unfreeze.
Now.. carry-on please...