No no, Blockland isn't unstable because of Windows. I've only ever had crashes related to iffy add-ons or the host screwing with the game-- anything else is likely to be hardware / driver related.
There is no reason why that crash wouldn't occur in Linux.
And if anything does happen to run "better" in WINE, its not WINE I bet-- probably just because there is potentially less bloat using Linux than Windows, so it is shown in performance.
Feel free to share some research into this, I am indeed curious.