Attu Games is a tiny two-member studio from the Czech Republic. We have been working on Feudal Alloy for about three years and we do almost everything by ourselves except music. We handle all game design, programming, art and animations, level design, story etc. We've already released one commercially successful game - a puzzle platformer Toby: The Secret Mine. It came out on all main platforms - Steam (PC,Mac,Linux), Xbox One, Playstation 4, Nintendo WiiU, iOS, Android, AppleTV and it took about one and a half years to make.
Source: The Developer Website.