Hi Jetcutter, thank you for your purchase. At the moment jump is not implemented. Let me know where you stuck, maybe I'm missing some proxies. There are some small fences that have also small gates.
About the QA builds, you are not having access to QA builds, you are having access to early builds, future betas, final game and any other content exclusive to supporters. You have also VIP channel in discord. I will contact you via email with the details of your access account to the intranet.
Please let me know where you stuck and I will solve it in the next build.
Thank you again for your support.