Hello!
Thank you for playing my game! I put all my artistic skills to draw these monsters. : D.
The monsters continue to lose HP, even if the player stopped clicking, because the first and second updates work as auto-clickers, but with various damage and third are a simple instant kill.
Unfortunately, I did not have time to add a tooltip to the buttons of upgrades. This is the second project for gamejam, the first one had to be postponed due to the realization that I did not have enough time.