May or may not.. activate in these 3 countries:
Peruse for your own information

Shiftlings is not available in my region. According to Steamdb, the game is unavailable in the store for Korea, Japan and China. Retail keys would probably be able to activate though (there are no separate packages for these regions).

(Also.. someone play this and tell me if you actually enjoyed it. Is it a fun co-op game? HMM.. maybe.. maybe.. )