tip to not have to bang your head on the wall/celing like an idiot so the game is 100% fun and 0% banging your head on the wall/celing like an idiot: shot at walls and if your shot doesn't explode at the wall there is something there
i got at least 299 diamonds by collecting 2 red diamonds (that adds on 200) and then i unlocked tadpole mode and got 99 diamonds from my first go at tadpole mode. 200+99=299