After playing through almost 333 waves (I lost 5 seconds before the end of wave 332, on the most squiggly track), I have to say it's a pretty good game. Will I play more of it? Probably not.
But it all works, even if it takes a little getting used to. Selecting the space and then the tower is a bit unusual, and at first I struggled to see what upgrades looked like, but that's it.
This is a game where no real complaints or compliments. Which doesn't happen often, so, good job.
(I'd like to give it 2.75 stars, I think)