How to make enemy appear around the player?

[maioooooomee]

So, I want worms to like appear on the sides of our jellyfish which is an attached planula and polyp(a type of jellyfish) and the player have to tap it to make it disappear then everytime they tap the worms, the progress bar will increase by 5. but if the worm touches the jellyfish, the health bar will decrease by 2.

[maioooooomee]

[maioooooomee]

here is the position of our jellyfish and the tap text, everytime the courser touches the jellyfish. the progress bar increases by 2. but what we wanted is that the one being tapped is the appearing worms, just like the piranhas in the game Dumb Ways to Die