Not sure if I was missing something but found this game a bit hard at first, sometimes the skeletons wouldn't spawn and sometimes they did - once I had the groove though it has got an awesome gameplay loop - was managing to rack up quite the army and cast lots of meteors!
Loved the audio and art style for this, don't know why I was thinking of DEFENDER the entire time.
I think the loop theme may have escaped me a little bit, I was trying to see if I could move my spells around to time it with the loop but it never seemed to work, was always better to wait so I never really felt like anything related to loop was happening.
A good submission, well done!