After the cutscene I really wasn't expecting to be the tower, that was a really fun twist! I personally think that it was hard to aim the missiles (nukes?). As far as I understood, the tower only shoots where it's moving? So with a keyboard, the tower effectively has only for shooting directions. I didn't try it out with a controller, so maybe the game plays better with one (On that note, props for adding controller support!) . Also, the font was a bit difficult to read.
All in all, great job!