I've been trying to buy Universe Sandbox 2 using Amazon Payments, but every time I try it takes me to the Humble Bundle website with an error message saying:
"We have received too many purchase requests from you in a short period of time, so we have canceled your order (you will not be charged)."
But I haven't bought anything from Humble Bundle and I waited two days to try again and the same thing happens. I rather use Amazon then Paypal, can anyone help?