which engine is it built on?

[*Yuki*]

[Nanaki]

Hi.
From the kickstarter page of this game :

Also, we're currently using Scirra's Construct2! It's an awesome game engine which our team members are very familiar with.

[EvilDiver]

They decided to change the game engine from Construct 2 to Unity. Unity can export the game for more consoles than C2.

[Onagro Studios]

Möira's demo was built using Construct 2.

For the full game, however, we're switching to Unity.