If you already have the game "Outcast", also by the great Capacle, use the scenario creation table available on page 6. Just roll the dice 2 to 4 times and combine the words in a way that gives you an idea of a setting or theme for your Push-powered game.
For example, the idea for the game I submitted to the jam yesterday, "In the Ocean's heart", came about this way. I got the words "sea", "fire" and "beast" in the table and, after some thought, I imagined a game with a steampunk setting about underwater exploration.
Anyway, I hope this tip can help in some way. Good games to all!