4 years ago(+1)
oh thank you!
I beat the boss, which took a bit(the blade attack and the ball attack were annoying)
I tried saving on the ending credits and got this. 
The propeller move has already been massively nerfed, but I probably will continue to make some tweaks to make the fight not drag on as much.
You're actually not meant to be able to save after beating the boss, but I didn't realize it was even possible to pause at that point so thanks for letting me know