Wow, I loved playing this game - I got up to wave 29 before I had to stop due to time, but it was a lot of fun!
I loved the music, it is purrfect, haha! Super cute and funny lyrics. I loved the little speech bubbles giving the units funny character. Great variety of enemy units! I loved upgrading the King and his squad and taking an active part in the defense. sacrificing myself strategically multiple times to take out the early minigunners :) I am very impressed by the art style and the polish is super impressive, and all the different upgrade trees and options, and I like the ability to invest in the economy, and all the compounding damage and health upgrades felt great to invest in!
I only noticed a couple of minor issues: I noticed some buildings where I had difficulty standing on the upgrade circles (north catnip farms - perhaps just a bit crowded with the other buildings, still possible). And the towers to the far east: it seemed like their collision detection was just a touch too far down, so I couldnt upgrade options 1 or 3, 2 could just work on one below the road , but nothing on the one above - perhaps due to the enemy warning? 
I noticed the squad members can sometimes get stuck to the south of the river unless you lead them over the bridge, just a minor pathing thing. :)
I would love an option to turn off just the music, or lower the volume perhaps, instead of also disabling the sound effects when you press "M". The sound effects are great, and I miss them when disabled.
Amazing game, thank you for enabling us to resume the game later, really well done overall!!