Mushrooms picked up after becoming big Squario will fill him, up to 5 times
Added underworld background and flipped the pipes to the ceiling
Added pipes to break up levels, levels get progressively longer
Every other level has more of an underworld layout now
Starmen and thunder bolts should only spawn towards the second half of each level
Every 20 coins you earn an extra life
Cleaned up hit detection
Lots of random backend cleanup and other things I already forgot about