Very fun game! I played around with it for some time to see if I can find any potential exploits and here's what I found:
- In the last level you can jump with water through the large gap to the ending by pressing "jump" when you are on the conection of blue semi-walls
- With precise movement you can put one character on the other and walk like this for any distance
- It is possible to push and position the boxes to make them rotate and place them on higher ground
Not all exploits are useful in the five levels you have, but when adding more levels to the game you might want to consider them :)