Market unlocker can remove market restrictions. In this situation you mentioned play store display incompitable issue, as well as you mentioned you can install app which download from developer site. Looks like its not a hardware incompatible, issue. However, I'm not sure. But try market unlocker or market enabler apps. But they need root.

 

Dude I have a good news. Actually I forget to mentioned it. When I try to download Sony panaromic camera I face similar issue. But I used Real APK leacher and download Play store apk to my pc. You can use that tool. But use fake Gmail account.

 

or you could alert the developer to the issue. some apps are uploaded by developers with a compatibility list. market then checks the device id (which you can manually change at will if rooted) and either downloads or gives incompatible error.
alerting the developer would help the community and rooting to test a device id change would help you immediately.
i don't remember what thread but there is one for a game in this section that tells you how to do it.

**edit

its the dead space thread.

 

If it is incompatible , Have you used LCD Density changer (Messes up the Google Play Store) If many things are incompatible , What you really would need to do is update your play store or go into
Settings > Applications > Manage Apps > Click Google Play store
> Click "Clear Data > Click "Uninstall updates" > Then open and it will say Android Market is being upgraded into Google Play , Continue , Sign in , And Then wait like 10 -15 minutes (On WiFi/3G or 4G) and then most apps that ussually are will be compatible , some games wont work on some androids , So many to choose and all games on iOS will work on iPhone 4/4S , That is the ONLY good thing about iOS , but I of course , Prefer Android

-Mike from Verizon Wireless at Peabody , MA
"Verizon is the true #1 carrier of the USA covering 98% of Americans , Introducing the new SHAREverything plan , See online for more details , Only at Select Stores"