It's not good
Positive: I like the gun design
The fire sound
Negative: Enemies are badly drawn.
In the end it says that we can review our score, but it doesn't show our score(how many we killed), so that makes us count the sticks we killed.
It get's boring after a while.
You should practise more before you submit anything.
You can post your work in Dumping Grounds.
And then you can give the link of your work in the forums, so you can get feed back and ask questions for more improvement.