Far too little is explained. What is "scraps"? Do rewards give benefits? What's with level up(does it multiply values or add flat amounts)? Does ascension do anything besides allowing you to rebuild everything, while keeping upgrades? When are level ups available? Do the towers have any special effects or are they just different in those base stats? How exactly does the level up work? Sometimes the level-up bar falls or jitters, what's up with that? Is there a benefit to level up as it seems to reduce income as enemies are now tankier?