Thanks for playing the game!
Some of those are clarity issues I would have liked to have fixed, but the flipped sprite is intentional as each choice that fills the bar changes the game in some way, either doing something silly or giving you a powerup generally.
Unsure about the velocity change, there is a bonus that improves move speed and one for fire speed as well.
The Skeleton bones continuing to fire was a choice but still not sure if I like them better having them stick around or be destroyed.
Originally the enemies were supposed to be color coded to the drops but with time crunch was not able to get that implemented.
I really appreciate your thoughtful feedback, and thanks again for playing!