In reply to krtake's Mar. 26, 2016 question:
Hashi Ex-Machina is "scored" in elapsed time, displayed as seconds.
It won't display your score in the list until you switch the display to look at a different puzzle size score list, then come back to the size that you just finished, and it takes up to five seconds to finally update the list, if the score function is even working at all. Sometimes a bug prevents best scores from being recorded.