Due to the recent firmware exploitation that allows homebrew and region-free gaming, Nintendo has pulled IronFall: Invasion from the 3DS eShop in both North America and Europe.
IRONFALL Invasion is temporarily unavailable on Nintendo eShop. Apologies for the inconvenience. Stay tuned for more information.
— Nintendo of Europe (@NintendoEurope)
Luckily, the game was a free download and many people who actually wanted to play the game were able to try it by now. Did you check out Ironfall: Invasion? Do you still have a copy on your 3DS?