Good game
I have to admit that I have a natural weakness for Pixel games. They're visually appealing to me. This game has it's faults (as said before shooting speed) but more than that I couldn't tell if when I clicked on a unit twice (once to initiate a unit building and a second after that) wether it was queuing up another unit to be built or just spending that units cost in money on nothing. maybe add a queuing feature or if there is one there make a way of showing how many units you have queued up to build