Great concept and puzzles. However the mechanic of throwing the diamond to whoever needs it and missing is frustrating as you have to start the whole level again. But that may just be my bad aim. :P
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Thanks for playing the game. I agree with you throwing the gem is fine the problem with the gem it self, I used Rigidbody2d for it but it gives that backward effect, I was planning to changing to KinimaticBody and creating my own physics but I didn't have time for that, and Yes it is frustrating even to me, but you can go around that if you aim to the right spot so it doesn't go back or stop. I was planning for a checkpoints because the game is hard but I didn't have time for that too.
I hope you enjoyed it with those problems. I am curious which level you reach.