So, sales breakdown
Shovel Knight total sales - 1,200,000 copies (retail + download)
SKSteam (32%) - 384,000
SK 3DS (29%) - 348,000
SK Wii U (17%) - 204,000
SK PS4 (10%) - 120,000
SK XB1 (5%) - 60,000
SK PSV (4%) - 48,000
SK PS3 (1%) - 12,000
SK GOG (1%) - 12,000
SK Humble (1%) - 12,000
Thanks. Adding the numbers to the OP.
Edit:
I also added a note from stump mentioning that these are all +/- 6000 due to percentage rounding.