I liked this quite a bit! Poison seems like a good buffer troop, with a respawn time almost as quick as the cat. Also nice little duckling eating near the silo.
The sound effects also grew on me. I like the sound the snap trap does on its first snap.
Great touch allowing players to access the menu with the Esc key during a match if they want to pause, want to check up on what each troop does, etc.
I lost a little interest at around wave 7, mostly because I hadn't thought of spawning a cat and waited for my slow troops to make their way to the rat nest and start the next wave. Also not sure if there's any indication to how much health you have or how many hits you can take (It took me 3 hits in 1 wave to die, not sure if health resets with waves or if it carries over). If I missed an icon, whoops!
Also just noticed this was a jam submission - thanks for uploading, good luck!
Edit: I think the front of the barn is the healthbar, I guess I did miss that!