I actually don't think the flop check is so godawful, since you are heads up. I very rarely slowplay at the low limits, but missing 1 small bet here isn't the end of the world. If you ever do slowplay in small stakes hold-em, then the one instance you would do it would be in a small pot heads up w/ a monster hand, so this situation could apply.

However, checking the turn is a cardinal sin here.