Really fun little game. I found that the MS Paint graphics lent a certain "low budget" charm to it though there were a few little things that could have been improved. Firstly none of the enemy units had guns. If a couple of the higher level units did it would have made the main stages more exciting, at the moment they appear to just get a little longer and different backgrounds.
with just a couple of tweaks this could have got 4/4.5 but I had to knock it down for the level of mundane levels.