I want to be able to collect cities via combos (more or specific combos required for each subsequent city). I want each city to grant you a special power when you get it and you can cash it in by hitting the ball into Gene's head. This should also be abort-able so I can choose to cash in or wait to combine powers. Combined power are worth more than single powers. Think stargate and collecting quartz, if you wait to cash in then the prizes get better.
If you collect all the cities then I want another sub wizard mode.
Given the more recent code style of collecting ghosts/ killing walkers, I think this is more likely what was originally intended. This is also the layer that is missing from KISS in my opinion.