I liked the progression of the Sheep and what it did for the feel of the game but I would have liked an indication that I had achieved the final form of the sheep.
The animated hearts and pop sound effects were also very satisfying and helped make it feel each click had an impact in some way.
The Music was very fun and gave the game a lot of life, turning off the music feels like taking the soul of the game away in some ways. The music does begin to irritate after a few loops so it's truly a love hate relationship but nonetheless it works.
The functionality of being able to buy multiple upgrades at once is also a fantastic feature that I personally think was brilliant!
All round, a big well done to team ;