Very cool concept! I love the combination of light colors and defense mechanics!
I think the crystals acting as crystals is cool idea.
Gathering crystals dropped by moths is satisfying and I can see this game developing some good resource management mechanics.
Feed back:
I couldn't figure out how to rotate the tower's aim for the new ones. Some more indications or user manual would be a great help! The moth's path algorithm could see some improvements too.
I love this game. Keep up the good work!