Hints and Progress Bar
The progress bar below each scene shows the player how close they are to completing the intended shadow silhouette by lighting up each circle. Sometimes, though, there is a secret shape players unearth that the game designers built in as an extra incentive to gain more points, and to further fuel the imaginations of its players. While there are hints in the game that players can use, it is encouraged that they are utilized only as a last resort so as to continue challenging yourself. The progress bar itself serves as a hint feature, but could also be seen as a crutch for players who would simply rotate the shapes mindlessly while only paying attention to the bar for progress (which is fine, too, if the object of your game is to relax!).
It would be interesting to have a conversation with students following some gameplay to ask about the timed aspect of the levels and compare to responses about their use of the progress bar - is there a difference in "strategy" used by each gender, for example? This is a game about spatial reasoning, as students are creating silhouettes from abstract shapes, paying some attention to the direction of the light. If girls, as relayed in lecture by Jenson, J and de Castell, S (2019), take their time when presented with spatial challenges, the timed aspect of the game might not be an indicator of who can figure out the silhouettes "best".