This concept can be really expended upon, I like this.
For me tho, the game currently is too slow, and not really challenging. I think you should speed up things by both increasing the speed of the space ship, and adding more enemy types. I do know that you didn't have much time, but I'm telling that for the future update if you ever plan on doing one.
The shooting sfx was a bit too loud, which caused me to not listen to the music the way I wanted to, but I liked the music.
In terms of the concept. I think you should add the ability to also crash into things with your small ships. This way you do get stronger when you get them, but also it's harder to dodge things.
This balance is something which can really boost up the enjoyment of the game, and it's replayability.
Would love to see this game's progress in the future.
Well done!