Sorry to hear that! I suppose a tutorial mode might have been helpful... Alice's dialogue clearly isn't enough.
It's tower defense at it's core, so you need to place units (towers or magical girls) by dragging cards to the map. You can also use a variety of other cards to buff units, or cast a few other effects such as heal or a special attack. (You can change the deck at the table in the bedroom)
The main problem I've seen some players run into is that you need to generate enough energy to keep casting cards... it's best to start by placing a few glamour-source units first. (These are the "glamour spring," "glamour fountain", and "glamour well" cards.) Without a sustained energy gain to power additional card usage, you'll quickly get overrun by enemies.
Anyway, your feedback has been helpful actually... I should probably add a tutorial stage that better explains how to play.