A mage has to chose to either cast a wide range of spells, or concentrate on a few but master them.
A 1 st Lvl character could have a wide range of unbalanced spells, that's true.
This does not compensate cheap and powerfull spells effects.
I thing minuses for scailing and casting time greatly balance the PP's for casting.
The basic range of Longdoor is 100'.
Fairly enough to ruin any exploration scenario.
Invisibility only works as long as the target does not attack or cast spells also the base version does not include stuff the mage is wearing, and teleporting blind into an area can be suicide.
he would only have to wait until 2nd Level to be able to cast the +3 scaled Invisibility.
We can say that HARP's spell casters are munchkins.
Ok, that's a matter of taste BUT =>
How can we explain that Darkness basic cost is 7 ?
I see no reason why such a "simple" effect could cost (almost twice) more than a matter teleport. (A Darkness + Dark Vision could justify such a cost, but not Darkness alone.)
Worse => how do you justify that Darkness cost more than Invisibility ?And Earthen Transmutation for 100 cubic feet => 14 PP
(isn't it a bug ?)
Darkness is not often usefull and Earthen Transmutation can be emulated by using tools (and a lot of time.)
Teleport is extremely usefull and nothing can emulate it.
(except several billion years of patience
or the use of an amazing quantity of energy)