fix: Ensure enemies move with slices when they bump into other slices

If a slice is falling and hits another slice, we bump it up like a
"bounce". Ensure any enemies riding on the slice bump up with it,
otherwise, they snap into place when the slice finally lands.

src/objects/Slice.ts

@@ -180,6 +180,7 @@ export function slice(options: Partial<SliceCompOpt> = {}): SliceComp {
                }
                sliceBit.parent.fall(fallCount);
                this.pos.y-=1.5
+               enemies.forEach(enemy=>enemy.pos.y-=1.5);
             });
          });
       },