1. I do not like being constantly chased by the robot that is basically invincible until I find the super laser thing to kill him with. Maybe you could have introduced E.M.M.I. half way through the game or something. I find the E.M.M.I.s nothing but annoying and not fun to deal with what so ever.
2. It is somewhat easy to get lost and have no idea where you are suppose to go. All the levels and stages and rooms look a like. If you compare this with Metroid on the SNES all the levels looked different, the rooms were easy to remember where you had been before. Just poor level design
3. The music is nothing special, I can not remember one sound track to this game. Compare to other metroid games where Ii can still remember the music to.
4. The controls seem a little hard to get use to, sliding, aiming, selecting rockets, etc. It is hard to remember what all the buttons do and I often find my self pressing the wrong buttons.
This game come across as a choir.