Research on flash 2D games

I started my class research playing 2D flash games of various genres. Out of the games that I played, a few struck me as original and entertaining.

Xeno TacticThis is a defense game for the most part. The idea is that enemies enter from one side of the stage and their goal is to get to the other side. The player has to stop them with a maze of turrets, which can be bought with money, which you get from each kill. Each wave of enemies is progressively stronger and faster, making it more difficult to stop.

Dofus
This game I have actually been playing for a little over a year now. It's a flash based MMORPG(Massive multi player online role playing game) where a person can roam freely in another world. The world consists of monsters, quests, dungeons, and other kinds of tasks to keep you busy.
You start off choosing 1 of 12 character classes to become your player. Each class has 20 abilities and spells that eventually become unlocked as you level your character. There are guilds for characters to join and get into group fights with. But the main reason that the game interests me is it's Player versus Player system(PvP).
The way it works is that there are two alignments. Bontarian, which play the role of good doers with angel wings that become larger as you gain honor points, and Brakmarian(devil wings) are the polar opposite. The two main cities of good and evil are on opposite sides of the world map, and any territory in between is fair game to be conquered in 8v8 group fights.
The system for territory control is done via use of items called Prisms. When a territory is occupied by more than 50% of an alignment, they can place a prism. Now, it is the job of the opposing alignment to attack the prism with up to 8 people, and await up to 8 defenders.
The fighting system is turn based, much like chess, with squares for movement and obstacles to prevent line of sight for attacking.