The particle effects were nice :)
When the UFO appears, they are already very close to the character, it might be nice to have a larger field of view and see them coming from afar. If we miss the enemy, we can only run away from it to survive, but then it we can't shoot in its direction. Could be nice to be able to shoot backwards.
It was a bit disturbing to see UFO flying in the foreground and background at times.