Didn't have time for actual patterns, so the patterns are randomly generated. The small ones you can avoid and murder waves are just bad luck. I can definitely improve the bullet pattern system, but I want to make set patterns for the completed version.
I guess I can explain the use/send function since there's no tutorial. Using a card will activate it's main effect. Sending a card will send it to the top bar so it can be used for cost. Using a card as cost will activate it's Mana Leak, adding to the battle in some way.