Really cute and fun game!
I'm really a tower defense enjoyer, it got me glued to the screen for a while! Definitely a great time killer! (I am at wave 38 and counting)
The only things I noticed was that some options were severely underpowered (melee and traps), and some others definitely too good (chickens and pigs, but mainly chickens). Maybe the costs should scale the other way around, with towers keeping the same price but upgrades scaling more and more?
Also I noticed a bug where prices don't reset after restarting the game (you must reload the page for prices to reset)
I would maybe like an option to sell or move the towers.
Overall, a very fun game!