Version 0.2 released today with many upgrades and changes. 

• 9 levels (levels aren't tuned yet, still a proof-of-concept)
  • Start at beginner, medium, and hard
  • Restart from same + current level
• Heat behaves differently--fills up, locks, and then flushes so you're not constantly dipping in and out of heat
• Using an invalid factor causes a misfire (sound and you still build up hear)
• Prime Button
• s on the side now work, and disable when a prime isn't used on a level
• On higher levels, there are additional primes greater than the available factors
• Prime Bomb--use it to clear all primes (any enemies reduced to primes including those greater than available factors)
• UI includes kills/required this level
• Juice improvements

Known bugs:

• Number pad keys will fire multiple shots in quick succession (or maybe this is an issue with my hardware)
• Prime bomb rays will eliminate all primes, including those they haven't reached yet
• Level indicators won't display correctly after level 5
• Game will stop after level 9