Very cool game, the graphics and music are top notch. The first tutorial levels are good, but imho even the last puzzles are still a bit too easy, could use some more game mechanics maybe, like button to make new bridge appear, maybe a movable floating platform (a canoe?), a trampoline to skip one tile, push crates, removable obstacles? idk
Also, just a level nr in top left corner doesn't mean a lot, players don't know if there are 15, 25, 50 or 100 levels. This type of game could use a level select screen, so the player knows how many levels there are.