Tower Guardian Epic Defense is a 360-degree defence game: your tower is the centre, enemies approach from every direction, and you rotate to face them while summoning warriors and using abilities.
The rotation is what makes it different from a lane defence. There's no safe side — turning to deal with one approach means turning away from another.
There are no lanes — enemies approach from all 360 degrees, so rotating to face one direction always means turning your back on another.
They hold directions you can't face, which is what makes covering a full circle possible at all.
Yes — it runs in the browser with nothing to install.