Thank you so much! This really was a team effort.
The main trick with the dithering is to be able to set aside the third color and use it very sparingly. We also put the UI on a layer above the dithering so it is still readable.
I agree with your gameplay adjustments. It would be awesome if we could add some gates or requirements somehow. We tried making the final area a bit harder, but it became too difficult to play through normally.