I have to agree with JaffaSix. I have a game that is really close to completion (one or two months). May I ask what guarantees are provided?
Instead of using a sketchy external contract system, it would be better if you gave your support through their platforms. "Pass me your donation pages" sounds less sketchy than "Give me your game so I can fund you."
We do have a Patreon that you could join if you want to support us, there is no need to use external contract systems. And it is way more reliable and the result os the same. When you join the Discord community we have, you can state your demands.