Urghhh. Now I get it. Those " signs looking like the pause button are supposed to be sliding doors. In the pictogram dictionary, doors look different, and double bars are pause. If there is no need for blue signs in your grand design, you could consider just using a small door complete with color and texture for dummies like me. So just telling the little blue thingy to use door texture or something like that. And maybe exchange some of the arrows for the door hint as well. They are doors you have to activate. And there is at least one door that is a sliding door from one side and an arrow from the other side.
This is pixel art. I am surprised about those resolution considerations. I would have guessed that it looks the same at basically every resolution available to the usual systems, including small tablets. Also, at least on Windows, there is desktop scaling. The recommended scale is 300% for 4k. Games that do use internal high resolution should handle that differently, of course. But there are possible side effects. Like windows telling an app a much smaller resolution, than the display really has, depending how was asked.
So keep up the good work and do not fuzz about details too much at this stage. I only played for a couple minutes. But in the sea of lewd games, non-vn style games are rare (exclulding the plethora of rpgmaker stuff) . What I mean is an avatar running around like the olden point and click. Maybe the engine even supports clicking where to run. But even wasd is refreshing.