Released a bundle: OST (mp3) + a hintbook (pdf). 2 for the price of one! Hurry up to buy in STEAM! The Hintbook contains about 80 pages on which you will find: maps of secrets in every level, all Easter eggs, interesting facts and so on. The book is available in two languages (Russian and English). Full immersion in the game!
https://store.steampowered.com/app/1885300/Radioactive_dwarfs_Soundtrack__Hintbook/