I liked this a lot! I reeaaaally love the color mechanic for adding a twist to a spaceship shooter, I thought it was very innovative! Also appreciated the progress bar at the top to help me understand how much of the game was left and how long I might expect to be playing in order to see all the content.
The two pieces of feedback I have are:
1. It took me a while to find the colour map in the top left, it might be more helpful to put it on the bottom right of the screen so it's closer to where my actual fingers are, and if possible maybe there's a way to map the colours to the keys spatially in a line instead of in a triangle (I know that might make it hard for purple, but I found myself getting a bit stuck sometimes looking up to the top left, and then looking at the keyboard under my finger to see the letter, if that makes sense)
2. The other thing I would love to see would be making the L SHIFT button speed up the whole game instead of just the speed of the ship, or some other way for more advanced players to temporarily increase the speed of getting through the easy parts at the start of the game. It felt a little slow for me and I would have loved a way to speed it up more - that way beginners can still have it at their pace, and more advanced re-players can have it at their own pace too.
Hopefully this is helpful feedback, I'm still really impressed with what you managed to make :) well done