AmaZeus: Merge & Shoot

Combining Necro with the chemical reaction of 'hydrogen explosion' generated by mixing water and fire is the ultimate combo!! The Necro flies off, gets caught in the hydrogen explosion, then flies to another enemy and causes another hydrogen explosion there! While Necro is strong on its own, combining it with chemical reactions makes it the strongest, capable of defeating any enemy. I think it has potential.

Wave 18 of 5-3 is so hard I'm going crazy