[Dou8Le]

Chrome seems to crash every four or five levels and it forces me to reload the page. It's a tad annoying going back through my levels.

Perhaps consider a level select, since it's able to remember your solutions?

[alnis]

There is a level select! :-) It's in the Menu (Ctrl-0). We really should bring more attention to it.

[Dou8Le]

Ah, yes. That's very convenient.

I don't see anywhere to edit on level 21, and level select says there's one more...