Just like newclarityex, I also didn't realize that I could slide over water until I decided to randomly mash the movement keys to see if I was missing anything. Something to tell the player that they are purely cosmetic would've helped a lot! You could've also tried putting them in cells/tiles which the player can't slide over using the movement mechanics as this kind of movement often tends to create such gaps.
However, that is the only complaint I have! Everything else was great. I really enjoyed it! :D