Oh well, that's a pity. I have neither a second monitor, nor a coding skillset.
Should the dev plan to publish the game anywhere else, like on Steam, they should seriously consider an in-game hint system as part of the polishing process though. A game you cannot play without a walkthrough txt won't probably be well received. It's probably not as bad when you have been following the game and the walkthrough from the beginning, but for a new player who starts the game it's more than just a minor annoyance.
Also I haven't played Seaside Mystery, but if it's a new game the dev has a chance to get it right from the start this time. Or does that game also have a walkthrough txt that you have to follow?
Thanks for the quick answer anyway.