lol i was using the forward+ renderer, i haven't messed about with mobile or compatibility, though i really should since i do html5 games...
i initially didn't have shadows because i was worried about performance. but after reopening the project and seeing what it would look like with shadows, i'm gonna say i didn't do shadows because they add a lot of visual clutter that makes it harder to see things
the starting rocks were largely to teach about attaching rocks and to allow the player to kinda get a safe place where they can make different shapes- initially the game was almost impossible, so i may have gone overboard in making it easier...