It's a fun game ! I like how you gather resources while making sure that no enemies are attacking your ship. However, I found two main issues.
The first one is that the game should start when the player has finished reading the introduction. I started my first game mid-life in the middle of a wave because I took the time to read everything.
The second one is the movement. I don't know if it's on purpose, but the movements felt very slow. Try using deltaTime if you didn't, because otherwise the speed of the movements depends on the framerate of the player.
It's still a fun game to play and it's great to be able to finish a game in a week. I hope that my comment will help you in the future !