Balance fixes
- Price changes:
Additional shot 6000 - 4000. Extra life 8000 - 4000. Extra points 1500 - 1200. Invincibility 10000 - 6000. Bonus points 2000 - 1600. Lives 1000 - 600.
- Coin accrual rate in the menu increased from 10 to 1 second.
- Point accrual rate and amount doubled.
- Bonus point multiplier for eliminating enemies doubled.
- Protine spawn reduced.
- Reward for eliminating enemies increased:
Normal spider 8 - 22. Poisonous spider 18 - 46. Fly 24 - 76.