Good lord, it's 99.99% likely it's just for some ad targeting, and it's not like they don't disclose it in their privacy policy (http://www.cuttherope.ie/privacy.html):
We may also employ third-party ad serving and/or analytics technologies that use certain methods to collect information through the Services. These technologies may be imbedded within the Services and may collect demographic and location information as well as information from your device including, but not limited to IP address, UDID, software, applications, hardware, browser information, internet and on-line usage information and in-game information.
If you don't want this sort of thing to happen, stop agreeing to it. It's not like you need to play Cut the Rope.
We may also employ third-party ad serving and/or analytics technologies that use certain methods to collect information through the Services. These technologies may be imbedded within the Services and may collect demographic and location information as well as information from your device including, but not limited to IP address, UDID, software, applications, hardware, browser information, internet and on-line usage information and in-game information.
If you don't want this sort of thing to happen, stop agreeing to it. It's not like you need to play Cut the Rope.