I played another ten or so games. It feels much more fair with the colors being more balanced. I still haven't quite gotten perfect (best is 3 missed) but I think it's possible.
In regards to the hectic-ness, I had to restart like three times before grasping what was going on my first time playing so I don't think an easier start is a bad idea.
Also, there appears to be a bug that causes the game to crash just before the fifth wave. I have it roughly half of my games. I tried Firefox and Edge so I don't think it's my browser
Out of curiosity, did you increase the prep time at the start?
Thank you again for making such a great game!