Could I get some feedback on my circuit?
You're using a linear regulator to get 5V from 27V- further the regulator is only rated at 30V abs max. If the 5V relay draws only 25mA and the rest of the circuit 10mA you've got 750mW dissipation in the regulator - could be a problem. Turn the LEDs all on and you may have several watts. Maybe consider a 24V relay with a series resistor or LED (flyback diode directly across the coil). I would suggest at least a 40V rating on the regulator. Perhaps consider better LEDS that don't need as much current. A switching regulator may be a better choice.

As others have said, bypass cap on the micro, and use series gate resistors and pull-up/pull-down resistors consistently on each MOSFET, and fix Q4 (use a p-channel MOSFET) as Kyran said- pull-up or pull-down for off or on respectively on the port pin and a series gate resistor. Or an n-channel and put the relay between drain and +5V. 100k is okay for the pull-xx resistors, except for the reset switch where 10K is better (consider ESD on the reset finger too).

Speaking of which, I'm not a big fan of using MOSFET gates connected to the outside world, even with the 1K resistors. Use TVS or dual diodes on the gates of Q1~Q3 to protect against over voltage. The circuit as shown will never survive an ESD test. BJTs with added EB diodes are a cheaper way to go.

Make sure the internal reset and WDT of the micro is adequate or allow for an external one.