Thank you for your notes! I'll add: You can see some of the bosses' various animations in the Cakiary! It's a bit rudimentary, but we'll see about expanding it (haha) in the future!
As for your other suggestions, those are implemented by design. The secret boss interactions are intentionally difficult to obtain. (If you're really bothered, you can always enable cheats.)
Regardless, thank you for reaching out!
Viewing post in (UPDATE! V1.209) Fat Fleet comments
After playing some more and after a night of sleep, I can see in many regard some of these so yeah, I'd still request the power activation on Punk Pump at the least due to her mechanics with it XD
To at least explain myself on saying Pump herself would/should need it is really due to her unique mechanics with her own parry since she inhales bullets before belching them out in a counter attack, but it's also how she gets size as well. Also doesn't help that she's extremely difficult to get helpers with compared to everyone else i feel since, if the power is active it auto pops her and prevents the player from getting helpers. I do think her super belch being how it uses her power would be better since I think it would be a better balancing act in my opinion for Pump to try to get to larger sizes by constantly having access to parries and actively trying not to have SKU-11 pop her too early instead of using a single parry and her next attack just wasting the entire power up.
But that's just me and my whinging and whining since I do genuinely enjoy playing the game, and her especially, just sometimes is something to say even if it doesn't happen XD
Also in trying to figure out how best to get her other achievement for 20 bullets in one inhale, that's gonna take a while XD