I prefer "mass". Good idea on the shape.
Updated.
Finished?
1) The tactics has mispelled pseudopods "pseuodpops" but apart from that it looks sound mechanically.
(Leaving aside the quaint colonial spelling

)
2) Challenge Rating 1 might be a bit high, 1/2 might be enough.
3) I'm not
entirely sure about the Swim speed. Amoebas crawl along by reaching out with their pseudopods and pulling. As a rule they can't swim, although rhere are exceptions like
Naegleria which transform into a "swimming form" when they need to migrate.
That said, I see no reason a giant amoeba can't swim. The physics at macro-scale are very different to the microscopic world. Maybe it used the water it expels from its vacuoles to create a primitive form of jet propulsion to slowly squirt itself through the water?
So, I'm OK leaving the swim speed in or taking it out, it's up to you.
4) However, it could do with a Climb speed. Somewhere around 10 to 20 ft.?
5) We should do something regarding this:
"Amoeba is highly sensitive to fire, and a torch will do 1-6 hp damage to it per round of application (no roll to hit necessary unless the character throws the torch)."
Just add Add Vulnerability To Fire. I considered adapting the Plantfolk's Fear of Flames, but the entry suggests it ignores the damage and keeps on fighting. Presumably because it's mindless!
Perhaps tweak the tactics too?
Thus...
Special Qualities: Amphibious, blind, blindsight 60 ft., ooze traits, translucent,
vulnerability to fire
COMBAT
A giant amoeba simply lashes out with pseuodpods and seeks to grab and dissolve prey into digestible chunks.
Giant amoebas are highly sensitive to fire, and instinctively retreat from a naked flame.