Circle TD is the most classic TD imaginable. 

There is nothing superfluous in it, and the whole gameplay is extremely simple and clear.

Your task is to last a certain number of rounds and not to let the number of opponents on the map exceed a certain number. To do this, you have several towers that you can improve, and some special "towers" that will get you additional resource.

The enemies on the map appear randomly each round, and the health of the enemies increases with each round. 

Moreover, not all towers can attack one or another type of enemy - this is something to keep in mind.

The opponents run in a circle - their path is always the same, but the map itself is generated new each time, and therefore tactically successful places will always need to be chosen anew.

Just try it in your browser! https://andyfa.itch.io