This kinda feels, looks and plays pretty much the same as a certain tutorial game included with stencyl...
I might be mistaken, and my sincere apologies if I'm wrong (I'll even request to have this review removed if so...), but which parts of this game are actually made by you yourself?

I dont like because is the same boss in all levels and dont have power ups.

Add diferent bosses and power ups!! will be cool.

But now is boring.

level two has a bug that stops you from playing the game by taking away your ship tested twice.

It's simple, but not bad. Challenging as well. But, very repetitive, and no background change.

No story to explain exactly which planet I'm defending and why, also a very ugly title screen. Seriously, you know what they say about first impressions...also, the enemies are WAY too difficult for having no powerups or upgrades.

out of 10...
gfx - 6 (decent sprites, terrible title screen)
sfx - N/A (I have no soundcard)
design - 5 (poor planning and only the most basic of working theory)
gameplay - 4 (no real challenge, lacks upgrades)

overall, this game is a real snooze fest with nothing really to offer. I like some of the graphics, but there just isn't enough of anything to keep player's interest for long.