It's a little hard to use symbol to represent something on the machine, the choice of going with pixel art as limited some of my visual capabilities. For the color themselves, I plan on releasing a future version that also incorporate some color blocks based puzzle, so I would definitely need to find a solution if I want to keep it colorblind-friendly. But I'm not sure how much that will be possible, I'll need to do some testing.
Thanks for playing! I'm glad you enjoyed!