I was playing for a few hours and just reached the part that you have to get into the base after the first boss fight ( I played it in a single go so from start till defeating gibor)
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The giant sandworms are damaged by the explosive barrels you have to let them eat a few to kill them
I agree that the pointing in a certain direction could be better after that fight.
EDIT: Althou seaching a bit in a game is what makes it challenging right ? :)