Nice little physics based survival/buildery thing.
There were a few spots where bricks would or wouldn't get damaged where it appeared that they shouldn't or should respectively. My suspicion is that this was likely unexpected physics interactions, but it's also possible that there was some extra interaction between brick and the cannonball that wasn't being surfaced to players.
I think there's potentially room for extended gameplay through more unique brick types that grant more time, or restore health, or heal a brick based on placement, but I think it was wise to keep the scope small and get something shipped for the jam! Well done.