same here its bugging out when you have highest level jump and then try to upgrade to the highest level run speed - it just gets stuck with a text box repeating. im assuming this is why i cant get through the bubbles ?
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Thanks for letting me know :)
To get through the bubbles you need to dash (unlocked by obtaining the feather). To dash you need to hold the down button and press jump.
I think I only did 5-6 upgrades before seeing the credits, so this is why I did not spot the max level bug. I admire your dedication, though :)