It was previously just ineffective. Now it's impossible.
The reason I'm doing this is when you *can* grind (in this case, by
constantly getting free plasma and selling it), it kind of feels
like an obligation to do so.
It's still possible to grind within missions whose progress depends
on your pace, which aren't timed and keep generating more enemies
until you win. Namely: the missile boat mission, the miner mission,
and the third boss. (There might be others.) However, grinding in
these situations is quite dangerous and likely to take away the much
larger shield bonus at the end, and plus if you mess up when trying
to do this you're set back quite a bit, so I think these are sufficiently
worthless activities that no one will do them. (I never did.)
A supercharge at this point can suddenly make bosses much easier
(especially the case with the Star Killer). This kind of takes away
the tension, so it's undesired. (It's fine for Easy difficulty,
because it's possible to take in a Supercharge from an earlier level
anyway.)
The original charge cannon is so overpowered it's ridiculous. The
strongest weapon in the game, unlimited ammo, and the only setback
it has is that you need to charge it a bit. The lack of balance
obsoletes the laser weapon, which is fine, but it also obsoletes
homing missile weapons, *including* ones that are newer and more
expensive than the charge cannon!
Now, it's much more balanced. You actually need to shoot the thing
before it hits max (or have your target in sight when it does),
rather than being able to just hold the button at max forever and
release when optimal like you previously could. Basically, the charge
cannon is still the weapon which does the most damage, but it's now
much harder to use. Incidentally, not only should homing missiles
be a sensible option now, even the laser cannon has a place after
the charge cannon becomes available.
In most cases, this has also resulted in limits being lifted. (The
only place I haven't done this is for planets in intermission.cpp,
but I think I'll take away that 10-planet limit as well.)
This is silly. I can see that someone decided to restrict targeting
to one ship as a difficulty setting, but that's not a very good way
to achieve different levels of difficulty.
Also added more music and slowed down RE.ogg.