This is the jam winner right here. Well played
I think my only feedback is that you want too long to play your trump card, I think it's wave 9 or 10 that gets really freaky! And maybe if I'm picky the fireball is pretty useless...
But so much to love. The concept, the execution and polish - it's pretty amazing but what got me LITERALLY dancing even on the menu page was... the music! It's just perfect!
Oh another thing that made me smile, the styling of the error messages, it was just too perfect and made me nostalgic!