Original Steam Discussion topic:

http://steamcommunity.com/discussions/forum/8/620696522039822433/

There are over 5 million downloads for this app which was last updated well over 2 years ago.

The issues that I think need fixing for Android and general suggestions are:

Things to Improve/Suggestions
An up to date UI
Ability to purchase things on the Market as well as sell
Ability to trade from your Inventory
Be able to edit/submit reviews

Things to Fix:
Stop the app randomly opening when you get an email about a game on your wishlist being on sale
Faster connection to chat