Love the game. Great choice of art style.
My game has the similar 7 segment digit mechanism but I took a different aproach. You can check it out.
I read others' comments and I also found the half lit segment confusing. Understand your intention to help player identify the segment to work on to achieve the goal, but I feel it creats more confusion than help, especially when player trying to feagure out the action on their first turn (player see different result when applying same action on the same number but different digit). Personally I feel you can remove the half lit hint, make the action consistant so that player feagure out the action faster. After that it's their job to compare the current state with the goal, no need to give them hint.