I've been getting complaints from a client.
I created a simple pool app game for this one client.

Here is the message he sent me:

When you drill down to Publishing Options > Supported Devices, on the
Edit Application page of the app loader of the Market's developer's
page, my handset is among the list of those numerous excluded devices
for the manufacturer HTC. Yet it is 2.2 Android and has a 3.2"
touchscreen. According to the message displayed there, you have
something in the application manifest that stops it running on scores of android devices. Not just affecting HTC.

I don't really know how to fix this. Is there an option in Corona to allow all android devices to play the game?

This is probably due to the opengl, screen size, or screen size support.

Check out my tips and edit the manifest yourself:

http://www.base2solutions.com/walkabout/Corona%20Tips.html