The good news is that I have been playing Gummy Drop for 2+ years and I'm at level 79. I wish I had found the Wiki sooner since there is a lot of good information about Cities, Boosts, etc.
The bad news is that I know nothing about adding to a Wiki. I may be able to proofread some wiki pages.
With that said here are some comments-
The Tiles page should list tiles with tile icons.
My list of tiles:
stones cover white tiles
stickers (can be multi-layered)
regenerating smiley like sticker but can grow back
ice cube looks like ice cube
chained has a chain(s)
litter rumpled paper
bomb gummies timer on perimeter
desert tiles like sand
deep desert tiles source of desert tikes
color blockers need to match lots of dummies of the same color
unbreakable walls thick orange lines
breakable walls thin dashed purple lines
(My descriptions leave a lot to be desired)
I will stop for now to see if my comment is appropriate.
Also is there a Wiki page creation for dummies link?