Heat oven to 350°F. Lightly grease a 9-inch tart pan with a removable bottom.
Pulse cookies to fine crumbs. Stir in melted coconut oil and a pinch of salt until evenly moistened.
Press crumbs firmly into the pan, packing the bottom and sides. Bake 9–11 minutes, then cool on a rack.
Warm coconut milk in a small pot until steaming, not boiling.
Combine chopped chocolate, maple syrup, coconut oil, vanilla, espresso powder, and a pinch of salt in a bowl.
Pour hot coconut milk over the chocolate mixture. Let stand 2 minutes, then whisk until smooth and glossy.
Pour filling into the cooled crust. Tap gently to release air bubbles and smooth the top.
Chill uncovered until set, about 3 hours. Slice and top with fresh berries to serve.