Interesting...
Well, not bad.
You used the sprites well, however, the style of the dialogue box seemed out of place. That's not too bad, but changing it may make it "easier to look at".
What you have of the storyline so far is actually not bad. I'm not a huge fan of sonic, but you only need basic Sonic knowledge to understand it. So, that's good. Should the rest of it be posted, I'll be watching it.
The text and dialogue boxes, like I said, should be changed, but apart from that it's good. 3/5 and 6/10. Keep it up!