Although it was built in the Gothic period, but the reformed church of Kootwijk is a peculiar piece of architecture that doesn't let itself be classified that easily. It's a single-aisled church from the 16th century, with a tower and a choir which both are the same width as the nave. Nave and choir are also very low. The tower is low also, but massive looking, which suggests it was intended to be taller. Apart from the clearly Gothic portal, the tower is  decorated with shapes that are more typical for the Romanesque style. From the outside the distinction between nave and choir is invisible, except for the closure.
In 1930-1931 the church was restored. During this restoration the buttresses were added while the windows were given their current pointed shape. Before that the building was even less Gothic than it is now.