The movement needs a butload of configuration. It feels extremely slow and doesn't really do what you want it to, wich creates frustration. That, combined with the low speed of the bullets makes the whole game feel really slow. Not necessarily a bad thing, but judging on your choice of music it's not your intention.
The splash screen in the start looks good, but you should change the lines so that its not as easily recognizable from the Construct-does-art-example. Just a different pattern would be enough, just for some originality.
I really like the explosion when you kill the "Trojans"!