Justus, thanks for your feedback. I'll respond to your points:
1) You mean which parts of the enemy will hurt the player? Their hit boxes are generally a little smaller than their body shape.
2) Related to the power up capsule/power up roulette:
A) I lowered the movement speed of the power up capsule, however not by much because I recently chose to increase its hit-box. In this build, you can only hit the capsule area to break it, but now the area above the capsule respond to bullets too. So it's easier for the player to hit.
B) I will not be changing the switch frequency because what you described is the exact point. It's supposed to be challenging to get the power up you want. And you have agency too, you can shoot the power up roulette to force it to cycle. Just learn the timing, and manipulate when needed. (You can use the boomerang shot to pick up a power up too!)
C) I can try playing around with having the capsule flash so players can't miss it in colourful environments.