Thanks for sharing your experiences! I was surprised that Linux, compared to Mac is very strong. (I think Mac has about 15% Market share in the US and Linux about 2 or 3%)
so i went back and checked since this got me curious, but for my other games where i support both linux & mac, the ratio seems to vary from almost 1:1 to 1:4 linux to mac downloads. even at 1:4, that would still have the linux rate higher than expected for the 2/3% to 15%. (i don't have any conclusions that i can draw from this though!)