It seems to be a common comment, the idea was to force the player to realise it in the first level (what with the only valid option to be to go forward) but I don't think there's enough information given to the player visually to make that realisation. I tried adding a highlight over the die and forcing the player to stop and watch the enemy slowly move but I think that only made the movement mechanics feel unresponsive. I guess that's part of the problem of me making the level but already knowing the mechanic, I can't discover what I already know.
One suggestion I had was to highlight in advance the steps the enemy would make and show the number of tiles you make it move but it may well have been better to explicitly state the mechanic.