Don't add more than your own velocity when climbing up

src/control/collisions.rs

@@ -121,8 +121,9 @@ pub fn kinematic_controller_collisions(
                     // *───────────────────*
 
                     let max_y_speed = -linear_velocity_xz * slope_angle.tan();
-                    // Commenting out this line can help with the crate jumping issue
-                    linear_velocity.y = linear_velocity.y.max(max_y_speed);
+                    if linear_velocity.y < 0.0 {
+                        linear_velocity.y = linear_velocity.y.max(max_y_speed);
+                    }
                 } else {
                     // The character is intersecting an unclimbable object, like a wall.
                     // We want the character to slide along the surface, similarly to