Source points are supposed to be rare in Act 1 because you're on an island that's meant to imprison Sourcerors. There will be more ways (Such as source pools) to gather Source Points in Act 2 and 3.
If you only level Memory, the spells you actually have will be far less powerful.
A search function ... Id on't think there's a catchall 'search' button, but it's like left alt or left control that highlights stuff like containers.
I personally don't have any issues with the way the overhead transparency is, myself, but It hink that's gonna be more of a personal preference thing either way.
Carry weight works fine, as long as you don't try to hoard things yyou realistically have no reason carrying. Like, y'know, paintings that're bigger than you (I'm fairly certain, but could be mistaken, that the oens smaller than you don'tw eigh one hundred poudns.).
The Ice Dragon doesn't fight directly int he final battle. When he chills your party members, he's actually killing certain enemies that would otherwise one-shot you with absolutely no save.
That last point is definitely a bug and definitely needs fixed.
