Hello, I am the programmer of this game, I hope I'll be helpful) There are 3 types of obstacles: Seagull, Pit and Trash.
Player has 4 units to operate with. 2 of them counter one specific obstacle, I have a little guide to this system:
Based on this, units have emotions near their heads: they're happy if they do counter the obstacle, angry if not and confused if unit is alone.
Originally this game was designed to be hard, I will discuss it with our game designer, thanks for feedback!