In general, I do think that games whose devs release versions within a reasonable timeframe (like with this game) shouldn't be leaked.
However:
The v0.81a available here is (reasonably) safe. I downloaded a version from mixdrop and did a diff between it and the files from the last official version v0.76. None of the code differences are dangerous, so unless there was already attack code within the previous version (extremely unlikely) or the attacker is using a vulnerability in parsing pictures etc (also unlikely, considering the attack profile so far), there's no danger there. (Also, I haven't yet seen a case where the downloaded file from an official filehost here differes between filehosts - uploader users here are responsible for uploading, so far none of the attacks originated from their accounts, and all issues with regards to filehosts involved the filehosts themselves, not the files).
All of which is to say, this version is about as safe to download as the previous ones.
(Reworded a bit, was rather tired yesterday)