Good but little buggy....
It's a great start...i would like some more variety & fixes of bugs and I would give this a much higher vote...
I found it wierd that you could just hold down the space button and fire all the time...and on level 4 I just randomly died...and i think all the item to the left instantly build up to the rocket...
I played it like 7 minutes or so and then I got irretated always dying on level 4...