I keep getting the following error when trying to post my (positive) review:
"You have used this product through Steam Family Sharing, but you must own it in order to post a review."

Considering that it did not occur with several other Family-shared games for me or the other family member, I assume that the issue is with the settings on the developers' side.

If it does not get resolved, here's the review:

Overboard! is an adventure/visual novel. The goal is to get away with murder in a day on a ship.

The game is delightful. While each playthrough is rather short, they allow the player to gather more information and execute the next one better, with additional information providing new objectives, which in turn can be achieved on the subsequent playthroughs.

The writing is good and the investigation logic is straightforward, without any random elements. The art and music are just lovely and the only VA is present at the start, so nothing negatively impacts reading.

The only downside is the saving system - in order to restart a scene more than once, relaunching the game is required.