First of all - as it seems, for @NightZard Productions and @BillyMan as well - the game window is too small. For the most part, it is manageable, but at the bossfight it gets even smaller.
Mostly the games is pretty easy, but takes a relatively long time to get to the boss. So if I die at the boss, I'm not willing to replay the whole game just to get back to the bossfight. Also the boss' laser comes out of nowhere and is really hard to react to.
Overall, the game would need more polishing, but the graphics are neat and it has quite some enemy variety, so good job! :)