Yeah, it is probably only a SEO issue. Study why other apps are showing first. Adding shopping list in the end of the name and in the description of the app will probably fix it.
it's ridiculous that the SEO crap has been brought to these app markets and that developers have to worry about this, especially in system that is completely controlled by google. "shopping list" is in the app's description and it's a highly reviewed application with lots of downloads.
google has access to more valuable data here than they do with web searches. if the majority of users search for "shopping list" and end up installing 5 different apps, which do they usually keep installed? rank that one higher for future searches. you can't fake the number of app installs like spammers can gain junk inbound links for pagerank.
