[snewman]

+1 to this. It's also visually confusing, the gate looks like it's covering two cells.

Great game! Feature request: add a button that shows my submitted solution. I'd like to be able to compare it with the optimal solution (so it'd be nice if a single tap could toggle between my submission and the optimal).

[ianstormtaylor]

It would be nice if the “optimal” view visualized both my solution and the optimal one at the same time, like a Venn diagram.

[the_shivers]

Just added this, check out "Optimal as overlay" in the settings.