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All answers having "How about that!" as clue:

3 Character Answers:

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GEE

OHO

RHO

SAY



4 Character Answers:

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GOSH

TADA



5 Character Answers:

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ALLEN

GOLLY

ILLBE



6 Character Answers:

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DOTELL



8 Character Answers:

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GOFIGURE



10 Character Answers:

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IDODECLARE



11 Character Answers:

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ILLBEDARNED



15 Character Answers:

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CANYOUBELIEVEIT

WELLILLBEDARNED