A nice concept and looks fun and promising, I have spotted these bugs:

• Upgrade Class shows advancing to "working poor" even if you are advancing to a higher class
• Energy boosts don't actually cost any money Also, I would like to see some changes:
• See the criteria to advance to the next prestige level
• See the XP and leveling progress
• The energy bonus from higher classes is either very small or has no effect; it should be at least noticeable
• The energy boost prices are way too low