"Desktop Tower Defense" is one of the most popular clone of Flash TD. A very complete review here. The author, Paul Preece and David Scott (author of Flash element TD) have teamed up to make a new site : CasualCollective. You can play a multiplayer version of Desktop Tower Defense there.
      Message Miyaka22 ( 16 July 2021 14:35) : Very unique game and I really enjoyed it. Elk Grove Tree Care
      Message rosendamanns2808 ( 27 June 2022 06:23) : I will recommend this to my friends.