This might sound farfetched.
Your game was incredible. It had great animations, and it was a fun shooter. I gave you a lot of 10's because it was awesome, but I'm giving you an overall 9 because...it was a little too easy...even the hard mode. I really didn't struggle...it didn't take me forever...more like 5 minutes. It had a good connection, and was fun for the most part. My reccomendations are adding more levels, and having a charge shot. Also, different enemies. I don't think that many metroids exist. Great game, I bet you can make it 2x better. Can't wait for the next one.