Why wont my custom controlled gates in Cirq work on a simulator?

Question

To initialize a state in Cirq, I created a custom controlled rotation and a custom rotation gate. The effect of applying the custom controlled gates to the qubits doesn't seem to affect the state. Here's the definition of the custom controlled rotation gate:

a00 = 2/np.sqrt(30)
a01 = 4/np.sqrt(30)
a10 = 3/np.sqrt(30)
a11 = 1/np.sqrt(30)
class Con0Gate(cirq.SingleQubitGate):
    def unitary(self):
        return np.array([
            [a00/(np.sqrt((np.abs(a00)2)+(np.abs(a01)2))), a01/(np.sqrt((np.abs(a00)2)+(np.abs(a01)2)))],
            [a01/(np.sqrt((np.abs(a00)2)+(np.abs(a01)2))), -a00/(np.sqrt((np.abs(a00)2)+(np.abs(a01)2)))]])
def _circuit_diagram_info_(self, args):
    return 'Con0Gate'

And here it is in the circuit (ignore the first "rotation" gate, which works fine)

circuit = cirq.Circuit(
    RotationGate(theta).on(cirq.LineQubit(q1)),
    Con0Gate().on(cirq.LineQubit(q2)).controlled_by(cirq.LineQubit(q1)))

After running this through a simulator, it looks like the gate isn't controlling on the target, and only applies a rotation to the controlled qubit.