Is there a way to know when a new iOS app is released by a specific company?
One quick way is on AppShopper.com.


Enter "Kairosoft" in the search box.
Click on any app title link. 
Scroll to the bottom of the screen and click on the "Other Apps By This Developer" link. This will bring up a custom page for that developer listing all of their app titles and update info.
A custom RSS feed is also generated in the upper-right corner of the screen. This feed will update for any new app releases.