It took me a few tries before I realized that the tiles were part of a sliding block puzzle and not a grid of unresponsive buttons. I'd suggest making the initial setup such that one of the target tiles is next to an empty space. Or use "slide" in the instructions.

And this is really hard in terms of time pressure combined with controls. Feels like touch input would make it easier to control, although the sliding blocks are rather small targets on the screen. Or keyboard control for the tiles (up = move tile below empty space into it, etc.)

Took me many, many tries to get to score 3. When I did, the yellow marker wanted me to match it with "0," but putting the empty space next to it did not deactivate the laser.