Haven't seen anyone else comment about this but controling the game with the mouse is very hard, whenever i try to use the mouse instead of the arrow keys the direction im facing in jumps around too much for me to aim.
thought it that at first so i set my mouse speed to a very slow speed, still happened, thought it might have to do with the game being windowed so i fullscreened it and it still happened
I added a new version v3.06 which should use the raw input from the mouse - hopefully this will fix it but at least the speed should be different this time