For all the people having trouble with Doodle Army using a Samsung Galaxy S2, specificlly the I9100 version
We know there is an issue that typically manifests itself as a crash right around reaching the first checkpoint after the turtorial (for most people.) We have been pulling our hair as to why and someone finally responded with enough details for us to sort out a lead! And further digging turns out there is a known issue on this device that has a work around baked into our framework of choice (Cocos2d.)
http://www.cocos2d-x.org/projects/cocos2d-x/wiki/Use_OpenSL_ES_to_play_effect_on_Android
This gives us something to work with. Hopefully we get a fix soon, this has dogged us for a few weeks now.