On Monday, games developer Larva Labs its sales figures for its Android apps and complained that Google needs to make some changes to help developers improve their prospects. It suspects that the Android Market probably produces far less than $5 million per month, as estimated by the . That same report estimated that the iPhone application store generates $200 million a month, the veracity of which also has been the subject of much developer debate.

Larva Labs joins a chorus of developers, many of whom have been long clamoring for changes in the way the Android Market works in hopes of earning more from their applications.

One of Larva Labs' games, RetroDefense, was ranked first among paid apps in the Market and is now at number two. Another of its games, Battle for Mars, is ranked number five. Both games have been featured at the top of the Market and on the Android Web site. Yet the games are averaging $62 per day in sales combined. "Very difficult to buy the summer home at this rate," Matt Hall of Larva Labs noted in the blog post.

He compares Larva Labs' experience in the Android store to some of the better-known success stories on the iPhone. The game Trism, for example, earned $250,000 in its first two months in the iPhone store, according to its developer at Demiforce. Over about three months in the Android store, Trism falls in the rank of applications with 100 to 500 downloads. At $2.99 per download, that's a maximum of less than $1,500 in sales.

One issue is that there are far fewer Android phones than iPhones in the market. But developers say there are bigger problems with the Android Market than that.