What would happen in the sequel?
It's innerspace 2:
Tuck and Lydia leave for their honeymoon, Jack is after them to catch the bad guys.
Tuck has the chips on his shirt.
Not much of a premise if you ask me, because they'd have to work in it the miniaturization.
Why and how would Tuck go back inside anybody?
How could it make sense?
And above all, how could you raise the stakes of the miniaturization premise to make it worthwhile a sequel?
(like in Back to the Future 2, they don't just "go back for another adventure in time": they have to relive the same events in time of the first one adding one more layer to that adventure)