I agree that one key for mask switching is a good idea. Also I would suggest kind of an opposite idea: more masks. The Shifting Reality theme is implemented for 100%!
Thank you! I'm glad you liked it! Levels 4, 5, and 6 are passable, but they're very difficult and confusing. I should have added more hints besides the one in the center of the screen on level 4, or redone all of these levels.
