More details! You can find out even more about the DLC by following the attached links.
The OST, in addition to the familiar tracks, includes two bonus tracks not used in the game. Link:
https://store.steampowered.com/app/2165880/REFLEXIA_Prototype_ver_Soundtrack/
DLC is a collection of all the graphics (illustrations, sky backgrounds) in its original resolution of 1280x960 (and more) in .PSD format, so you can make any emotion on the face of the characters, as well as to find sketches there. Additionally attached are two text files: the terms of use (for example, i allowed to make merch with any pictures from the DLC) and comments on the development process (the whole story and the explanation of interesting details by me). After purchasing you can find all files in the main game's folder! Link:
https://store.steampowered.com/app/2266310/REFLEXIA_Prototype_ver_Original_Graphics/
Thank you, dear players, for all the love and support you've given to the Prototype ver.! And even if you're only reading the news because you added the game to your library a long time ago and then forgot about it, your contribution is very important, too.
We shall meet again.