(Message for Game Creator Below!)
Right then, since I didn't see any comments giving a guide, here's one.
When you first spawn go to (your) right, a little hexagon stone thing will be on the ground, that's one of the sprites.
The next one is just past those stones closer to the river, looks like 3 pebbles surrounded by tall grass.
Next is further down the path, there are movable stones, that you can place next to the hexagon stone thing. (Looks the same as the one prior.) I haven't yet completed this step, still trying to find a missing rock(s) to complete the small arc. (Don't forget about these rocks you will need them later for a hexagon on the bottom right.) The two obvious ones follow this, the moving reeds and steaming water.
The rest of the hexagons don't have puzzles, just press F and they will give you a scene, or picture.
Hidden ones include the plain "X marks the spot" joke to the right of the left-most river up near the top path.
A beetle sprite scene is sort of glitched where it lets you see it from the other side of the river, until you cross, whereupon it disappears. This could just be a high-tier game mechanic, but you never know.
One of the NPC's tells you a riddle of sorts, that says to "look between the ears" travel down the path slightly and you'll see a rock formation that's symmetrical and looks like a butterfly made out of four rocks, stand in the middle and bingo.
Since I am rather lazy and I don't know the word count allowed in these comments, the rest can be found by traveling up, (or down), the rivers, while avoiding the driftwood.
To the Game Creator: Excellent RPG game idea, the art style is very interesting and arousing, but it doesn't have the "Bang, Pop, Kapow!" That really makes a user want to pay for it. Perhaps make this game series free to draw attention to yourself as a game creator, then announce the release of an intensely detailed updated version of the game, or a new series entirely that will grab the attention of horny game-players. I am not saying it to be mean, but as a word of advice from a marketing connoisseur. Don't lose hope! You can still make it big!