Simple blink LED with PIC12F629
You haven't connected a resistor in series with the led, that can exceed the max allowed I/O current and damage the MCU

The connection you should use is like







simulate this circuit &ndash; Schematic created using CircuitLab

The resistor value is calculated using the following equation

$$ R= \frac {V_{in}-ledV_F}{I_{LED}} $$

The actual value depends on the current you want through the LED, the forward voltage drop of the led (Vf) and the I/O voltage.

As an example, for Iled=10mA, VF= 2v and 5v output from I/O pins

$$ R= \frac {5v-2v}{{0.010A}} =300 Ohm$$

So consider using a resistor value of 270 - 330 Ohm