I get the concept, and it'll have potential if you polish the game more.
At some point, the boss shot a laser continuously, without any randomness. There are some parts of the boss that should also shoot a laser. And the boss didn't fully rotate 360 degrees. Maybe due to the time limit (or because you guys got a panic attack [I felt it]), you guys can't make it on time.
The bullets are too big for me, and maybe you can put the camera behind the spaceship and move with it so the player can calculate accurately where exactly the boss' bullets are, although the player can switch perspectives. In exchange, you can increase the boss' bullet speed. I thought you made the 2D one to avoid the bullets and the 3D one to avoid the lasers.
And you probably use another key, like A, Z, or any other key, to switch and a key next to it to shoot. For example, A to switch and S to shoot, or vice versa.
Last, I got a trick to abuse the game. You just move the spaceship to the very bottom or top. While the player shoots the boss, there are no boss' bullets that can damage the player :)
Good luck, guys!