yeah you're right, gold is earned also by killing spider. it's not a balanced game because i didn't have enough time but thanks for the feedback
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Oh, I just retried it and I didn't know you could click the spiders to kill them. I tried clicking them in the beginning, but after one click there was no feedback and so I didn't try clicking on them any more. I think if you add some feedback that you are doing something, maybe let the player control the rotation of the moon a bit (I was constantly losing health faster than I could buy it because the spiders were on the other side of the moon) and balanced the mechanics a bit more, this could be a really fun little game :)