I think it's fair to be upset if things are broken and to point out that they are broken, but there's no reason to be rude about it. The only thing you are spending is your own time here. You did not pay money for this. These problems do need to be fixed, and undoubtedly will be. To be honest, I found Voices of the Void through Joel and hearing him mention that 0.9.0 was due out for Halloween brought me here wondering what happened to it.
At least as far as Itch.io is concerned, 0.8.2 is still the most current release. You have to go digging a bit to find any version of 0.9.0, and it's pretty clearly marked as an alpha. What, do you expect to get a refund? On what? The time you chose to spend?
If it's busted, wait until it gets fixed. If it never gets fixed, do you think a tantrum is going to spur anyone into action on your behalf? Who are you, even?