Good concept, but I would've liked the indicator to also show how the disk actually bounced off the wall (at what angle); it's really difficult to gauge the trajectory it'll take sometimes. The levels were well-designed either way.
The rewind mechanic felt... just kinda out of place; it didn't really serve any purpose except to give the player some more busywork while trying to line up the shots. It also doesn't really limit or enhance the main mechanic, as far as I could tell.
But hey, the art and sounds were pretty good!