The game was really clear and understandable from the start. Having to protect your herd adds a lot of depth to the gameplay, it's a nice idea. The balacing is also pretty good for a jam game!
I feel like the swatter upgrade to increase its range was more of downgrade most of the time since it hits further and further away from the player's position, and becomes a range option where it seems way better as a close combat "panic" option.
Maybe more visual feedbacks would help, especially with the rocket, which wasn't easy to get used to, since it disappears a bit too fast for me when you don't hold the click.
All in all, I had fun, and went for 20+ rounds. Well done!