I haven't played the bowling part in a long time and I don't have a save near there ... However, it seems from the video here:
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that they are either moving the mouse up/down or the scroll wheel.
using google - I just searched
bowling time taffy tales how to and this was the 6th result on the page:
View attachment 3361439
Which links to a pdf found in this post -
#11,088. From that PDF:
Day 53: Once you exit your house Becca will be there. Talk to her then head to the Mall for a date. Once there go Bowling. The bowling minigame is pretty simple. Click your left mousebutton and drag the mouse upwards to increase the power then release the button when you want to throw the ball. The sweet spot seems to be 75% power and releaseing it just before it hits the middle of the aiming area. That way you´ll get a strike every time.