Well, its greatly designed, nice graphics and good idea, but it's slow and repetitive.
It's really annoying to have to wait every single level to re upgrade everything you'd upgraded before.
It would be far more enjoyable if there was some kind of cash system and some shop thing where you could buy permanent upgrades to your bots.
I think its a great idea that could have been far greater than it is.
Still, its good, im just being bitchy; I played it for like an hour til I got bored.