The concept of this is pretty hilarious, and it's clear a lot of effort went into the execution. I wasn't a huge fan of having very little control over where things were going to drop, though. It ended up just being me mashing the button a lot and hoping I was in the right place. I think maybe adding a way to control the general area things drop in or at least maybe a marker that shows where the next thing will drop. That way you can kite the enemies into it and feel like you have a little more involvement in how the game plays out.
Overall, I liked it and I think there's a lot more you can do with the concept. Hope to see bunbun having some more crazy exploits.