Absolutely no doubt Devlin was at fault for the first goal.
The second is a bit tougher to call, Halkett was left to run from deep for a free header.
Best I can make out was Gallagher had him in midfield and then decided to ball watch, following the ball and leaving Halkett free.
Considine made a last ditch effort leaving Ikpeazu (his man), but for me he defensive midfielder needed to be switched on.

As it stands. (after the Hearts game)
Logan - 4 points
Considine - 4 points
Devlin - 2 points
Hedges - 2 points
Lewis - 2 points
Ojo - 2 points
Campbell - 1 point
Ferguson - 1 point
Gallagher - 1 point
Leigh - 1 point
McKenna - 1 point
Vyner - 1 point