Hey fluffy!
The LÖVE situation is a bit hairy, but the plan is for the itch.io app to actually support .love files on all three platforms (Linux, macOS, Windows).
I've already done the first 90% (making our own builds of love automatically for each version that comes out), it's the last 90% that's missing (integrating it into the app, showing the user which versions of the LOVE runtime are installed, cleaning up when they're no longer needed by games, etc.) - you can track our progress here: https://github.com/itchio/itch/issues/135
In the meantime, I believe `love.exe` supports dragging a folder to it (it doesn't have to be a zip-compressed .love file - I'm getting my info from this page), so maybe you can instruct your players to do that in the meantime? Let me know if that works out.