A really good summary of the game, it truly sounds like you enjoyed playing the game which honestly makes me happy.
It's interesting how there's already a few different builds despite the small pool of choices. I for one tend to go for bullet time efficiency and speed increases. But yes a burst heavy build can be fun.
Currently the game is endless, I would like to add a boss or two in the future but currently it just goes on for as long as you can.
Yep the lingering hitbox is a bug and thanks to you I've finally found the source of lag that's been plaguing me since release. So due to a small oversight the hitbox would linger forever if you spammed left click; ever stacking up over the course of a run. To make matters worse each hitbox would still perform their own collision checks gradually slowing the game down. Well that's a fix I'll be dropping after the jam.