Thanks a lot for the feedback.
I agree that it could be very useful to add some kind of letters to the orbs, but I didn't have time to make it looking good and not annoying. The theme "Nothing can go wrong" isn't about difficulty, but about the fact you are not allowed to use color that's not in the enemy, therefore you have no room for wrong choice. I have around 5k hours in RTS so it may be intuitive for me the way units move (for example, in Dota 2), so can't say much about this. As for difficulty, it was 2 times harder before final version, so I thought it's already very simplified ;) Thanks for pointing out the typo I overlooked.