"the BG messed it up, but everything else is ok"
For a first time, it a-ok. Personally, it's sort of similar to my lastest flash, but that's my opinion. The stretched backgrounds just didn't look right. Also, Metal Sonic hardly talks in the Sonic games, unless your talking about Sonic Heroes. I expected him to act more independent, like Bass is to Dr. Wily. Besides that, it's short and sweet.
Anyway, good luck if this becomes a series.
4/5