You want the water to drain into the drain! It appears that water would tend to pool between the wall and the drain, assuming the slope is from the main area into the drain. It could get there by splashes or directly from the showerhead. You'd either need to reverse the slope on the wall side to the drain, or move the drain next to the wall. Then, it's best if the drain is the full width, as you might get the same pooling at either end.