Good for a start
Some tips...
* Add something like a gun in the top, instead of just clicking the buttons, so it becomes a more complicated shooter...
* Sound is very important here... Add it as soon as you can...
* If you make robots move a bit more than just going up, it will make it better, but you'd have to slow it down so that it doesn't get annoying...
It's a good job for a starter anyways...
Keep working on it and you'll make something that makes you proud...
And ummm...
What's on the background?...
I can't figure it out...
Haha...