Bug Fixes & Powerup Distribution

Just a couple small fixes this time.

• The bullet sprite is now oriented correctly based on which direction the bullet is travelling
• Powerup variants of certain sections now appear more often compared to the non-powerup variant, but still only once per loop.
• Randomized powerup distribution reverted to favor all powerups equally, rerolling Solar Feather (extra jump) once if you already have two or more. The third loop will still always be a Solar Feather if you haven't gotten one yet.