Nice

IT is Ok. In fact I like it.
There are an upgrade shop (if you press spacebar). Well I suggest you to make 2nd part of the game and include as follows:
1. Different kids of enemies
2. Epic music. This one is not really suitable for such a game.
3. Include some bosses.
4. Include separate upgrade shop: additional guns, missles, support ship, the actual ship upgrades and etc.
Well I enjoyed the game.

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!!

Okay.

The game itself was fun. It felt as if the game was the same about skill as it was about luck. It would be nice to see some upgrades to go along with the level ups.