It's amazing that this was made in only 48 hours! The sprites look amazing, and fit perfectly. Plus, the sound design felt just like that old arcade game.
The only negative thing I can think of is the relatively slower gameplay. Making money while fighting off enemies is pretty slow. This means you can't build a lot of ships, which also means there can't be as many enemies. This just leads to slow fighting. This doesn't ruin the experience at all. It's just a minor tweak, but I prefer faster games anyways.
Overall, this game was incredible! The first game I've played of the submissions, and its a great one. 👍