I like the structured nature of this to start, but there's never a moment where you just get to move about the station unimpeded until after you've cleared the game which is unfortunate. Also, why arbitrarily have item pickups you can only get once and then never be able to access the room again. Just frustrating for no reason knowing I can't get the 100% because I missed one missile expansion in the first half hour.
Also, excellent sprites as always.