Overall, the gameplay is fun while a unique way to use the shield to reflect the project. I like the colour bullet that deals extra damage and the shield bomb. Although I find the complexity of the game is overwhelming for beginners as there's a lot of things to master in a short time.
One way to reduce the complexity would be introducing one colour shield first then introduce another colour shield, with this type of pacing will give players the time to understand how the colour shield works.
An alternate suggestion would be changing the controls, where WASD control and rotate the ship, the left mouse button to shoot, lastly holding the right mouse button with movement to control the shield. These will reduce the complexity by grouping control together.