Favourite bits: The fact you've used graphical tutorials, I always love these. The way you've hinted at some 'older' parts of the facility. Like with the rocks(?) and the dead bots etc. The boss fight is a great addition!
Unfortunately it really needs some audio. Some basic BGM, some thruster sounds and a basic shooter sound really would have lifted this. Also, the working space being larger (1024x768?) and the game being at 64x64 is really offputting.
Otherwise I really enjoyed it and it's a fun little title.