Ok i figured it all out and got to the end! The 5th diamond i needed to push the ball on the ground into the tub. The ball physics are... very tricky! After that the game made a fair bit of sense tho. Very merciful for the second ball to not be mandatory lol! Unless i did a sequence break somewhere. Anyway I ended with 339 diamonds because of that haha. Great and puzzling game, I loved the visuals and the whole experience despite how tricky it can be :)