I was sure to had answered.
I used "enlighted" with fireball.
after done that, what should I do to unlock more things?
Viewing post in Zombie Tower Survivor Demo comments
This is just the early demo version that doesn't include all the content, unfortunately. I need to fix the bugs first and then I will work on adding more content, like tower's global upgrade system and more abilities, talents, enemies, difficulty levels, etc.
I will be posting the updates here in devlogs so you can follow the page if you want to.