Mousepad might be tricky. The start screen is actually a bit of a puzzle. I attached a screenshot to hopefully demonstrate how the game works.
You can use WSAD to move around. Hopefully your mousepad has left and right click to select foliage and to rotate the camera.
Sometimes mousepads use gestures to scroll in/out. Mine uses two fingers moving up and down.
Thanks for giving it a try and commenting about your issue. Hopefully it helps others with the same issue.