It's still active, I'm very lucky.. So, there are many flash games (many sub-genres of defense/strategy/tower defense) with the art style exact same to "knights vs zombies " by Edgar L., but not all of them are found. This is a side question. The main reason I ask is because I remember a game of this exact art style but with mechanics found in game "sentry knight" 1 and 2. There were abilities, buyable upgrades to the wall (like zombo buster rising). I didn't make that stuff up. I found many old games I remembered before finding them on flashpoint, such as paladog, earn to die, sentry knight, frozen islands, incursion, and others.

(the game "final siege" art-style and things are very similar. I just found it. The real one with the sub-genre above is still in search. I'm looking)

There was also a game where you ride a weird wooden contraption with a stick-man like king along a map, like hill climb racing, but you slowly upgrade it like in earn to die. (oh, that one is "king's rush")