Game completed 100%.
Collected everything possible, passed in co-op, important version GOG 0.0.17. Cosmic skin + Digital deluxe upgrade.
Save step-by-step, 1 - after 1 boss, 2 - 61%, 3 - final boss, 4 - 100%
Installation with replacement
C:\Users\AppData\Local\Smurf_DreamsGOG\Saved\SaveGames
Author: FANIS WEST