This is a really unique combat mechanic. I enjoyed experimenting with different sticker placements and seeing how that changed combat.
I do think there were parts where my suitcase was flipping up and down pretty quickly, and it was hard to know what was going on in those moments; I might have been mashing the space bar a bit too much, though. If that's what's going on--because it's the same button to stop the bar and attack an enemy--it would be nice if there was a bit of "dead" time for input between battle segments. That might cut down on the accidental triggers.
I had so much fun playing this, though; it was a really fun mechanic. Congratulations on a great jam!