It took a moment to understand that the goal is to avoid the bombs while making the picture.
Because the game runs in a (small) window it's actually very easy, the cursor can leave the game entirely so there's rarely a danger of hitting the bombs. In addition to that, being able to move a tile from one position to anywhere else also makes it very easy to complete the puzzle, whereas a physical slider puzzle works by moving the pieces one slot at a time, with a single area open at any one time to achieve this.
It... did also crash once. :)