Acrue capital. It can't really be that hard, can it?
Code, regarded as everything that isn't inside the assets/ folders are distributed unde MIT license
Unless mentioned otherwise, all art assets (files in assets/ and with the .ase and .png extensions) are distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
Pixel Operator fonts are distributed under SIL OPEN FONT LICENSE. For more details you can find the actual license in the same folder as the font asset.