I think it could really benefit from some normal tower defence UI - i.e. a row of available towers somewhere that you can click/drag! That would make it much clearer what was going on, plus you could have a bit of UI to tell the player what to do
I got to about 14 points, then for some reason the redirection pad thing just stopped working and I can't work out why. Never got past that point.
I think it's a really neat concept that, like a couple of people said, could benefit from different spawn points and directions 😁