I have the same issue as Divisionlo :(
Hmm.. ok, I'm going to see if I can reproduce the problem with anyone here.
I think this may be the problem: the sideloading page should not accept this entire zip as a valid game. I've re-uploaded it as 2 zips (one with the game, one with the source). Try sideloading just the game one and see if it works!
It worked :) Thank you!
