I don't know Squiffy, and I was pretty much learning by trial and error as I attempted to help someone on the forums with a javascript problem.
Still, here is a test game for a simple inventory/sidebar.
If you want to complete this game with 100%, then you need to finish covered in soot, healthy, and carrying a dissolved key, talisman, bottle of goop, potion, acid, and empty bottle.
Code can be found here: http://textadventures.co.uk/forum/squiffy/topic/twsu7sqjoegndwy3_g_qxq/inventory-show-hide
Smoothest game I have played.
I checked out Squiffy app, looks like the simplest coder app, however
quest do not even requires me to code, so I will be lazy and stick with quest.