Aha! I think I've both played & enjoyed the game in question here, If you'll excuse me playing creepy internet detective
a link for those who haven't
All the cards read ok but I think more of a focus on the dog as oppose to the scene would be helpful for consistences sake in the middle card; maybe an action pose/ motion blur would work better.
Colours are a little washed out for my tastes but nice. Regarding achieving a painterly style I'd ditch more 1-px lines and little details in favour of broader strokes & shapes.
I love Border collies! In my edit I moved the nose up a tad considering foreshortening of the muzzel, gave the right side of his face a little more body, made the ears perky to better describe the intended emotion (happy), introduced the green of the background into the shadow of the fur to suggest reflected light, widened the grin and introduced 'superman hair' style blue-gloss. Left it pretty rough to allow for room for your own stylistic mores.
I should really be doing new-years type stuff but I love your understated, meditative games and chiptunes so I hope I can help!
Edit-forgot some stuff also my colours are bit over-dark/saturated