Cool idea! As others said, dying in 1 hit is really tough, but it was still fun to play! The aesthetic was fantastic, and the controls were clear and felt good. Though I have a pretty small computer screen and had to zoom out my browser to 70% in order to fit the entire game on my screen, which made things a little hard.
Though if you're considering accessibility, this game would be really tough if someone was colorblind. You did use the different shapes for each color, but there's no way to match the blast color to the ship color. In some cases, certain ships actually look like the blast shape of another color. (for example, the blue shot is an "X" shape, but the green ship is shaped like an "X")