I really liked this one! I'm a big fan of any space game that also lets me walk around the interior of the spaceship.
I like that you added a bit of time at the start to get used to the controls before the first wave started though - definitely made it more enjoyable.
There was a few times where the button I pressed seemed to move the ship in the opposite direction to what I thought it should have. I don't know if that's a bug in the game, or a problem with me though.