At first I thought the game was just about wacking enemies with the UI (which is a really creative idea!), but then I saw how you had to fill up the "mana" meter by dragging it to the enemies' bodies and it got you updates and was happily surprised. A very interesting roguelike. If you want to expand it, having each UI element (start, options, health bar) inflicting different types of damage or various types of enemies can increase the complexity :)