Nice game idea, I got actually stuck for quite a while playing it!
I would have liked for the enemies' moves to be more predictable (in particular for the satellite). Not being able to predict them clearly makes the game much harder than it should. I would be curious to know if it is possible to reliably finish it in the hard mode (let's say, is it possible for a good player to finish it something like 50% of the time in hard mode).
Also, nothing very problematic, but it was a little annoying to have to go twice in the door to leave a room (once for opening it and once for leaving the room).
Finally, I may have found a little bug: when one kills the last enemy of a room and reaches the door to go out at the same time, it seems that the door won't open (one needs to move somewhere else and go back to the door for it to open). This happened to me several time in the first room with more than one satellite.