[FLASH GAME] [around 2010] Tower Defense game with cat girl and boy

Hello everyone, i was remembering an old flash game i used to play on pc, tower defense style with gritty art style, sort of broken down city style, theres a cat girl and boy atop the tower, i believe both blue, there was a weapon upgrade system, zombie animals that attack the tower, i believe there were many titles, strongest memory i have is that there was a zombie elephant boss that occurred after a few waves, can someone help?