Since you made it so that you get rewards for being the fastest typer in parkour, why not put a reward for islands? Answer yes or no in this poll if you agree or disagree that we should get a reward.
I think you have the right idea but credits are quite valuable and because of that, I don't think it is a good idea. If that was the case, everything would have to be adjusted around the server regarding the prices in the creditshop.