I lost the comment I wrote, in short:
Another tower defense, nice! I liked watching the towers just doing their thing.
Audio and visuals are minimal, I really like the earth and background!
I played on browser(chrome) and the view + hud was very much off.
I am missing some more control of the player, could not figure out how to move the cyan marker to place the tower on certain spots, maybe you should wait for the placement though. Also could not switch to the inner ring.