To download the latest version of RUMP, you can find it here on Itch.io! The password is closedbeta.
You can send me feedback or bug reports on Twitter or Discord, or join the RUMP Discord to post it there.
The list of SFW games and tools that work with Intiface (and therefore with RUMP) can be found here: https://github.com/Renpona/awesome-intiface-sfw-list.