I figured out that some characters had synergies, and that these seemed to change periodically, and also that these seemed to influence whether or not the obstacles were deactivated, but I struggled to coordinate well enough to get any turtles to safety. Maybe I'm missing something? Would love to come back and replay later if developer replies to this comment with some assistance.
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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!