Started out adjusting prices, then ended up doing other things
while testing. Committing this now before I start doing other
random stuff!
But all of the changes are related to balancing difficulty, mostly
with prices, except for a couple bugfixes in the shop. Most notably:
* Ammo now costs $10, not $50. You no longer have to worry about
saving ammo quite as much as a result.
* Plasma upgrades' cost is now calculated differently, and the result
is slightly lower prices than before.
* Easy mode now grants the player more max ammo than other difficulties.
* Increasing max plasma ammo now costs less at the start, and increases
in cost faster.
* You increase max plasma ammo by 25 at a time, not 10. (10 was just too
small of a number.)
* Destroying enemy ships no longer gives you money. I found that, even
in hard mode, I had *way* too much money coming in, and this cuts it
down substantially. It also makes the shield bonus at the end of missions
much more significant. To compensate for the loss of massive bonuses
bosses used to give, these bosses now drop a lot more stuff.
* Kline has decreased health in his first encounter, and increased health
in his last two encounters (the numbers have been reversed).
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