I found some bugs in bossfight (chapter 5)
1) sometimes orbs don't appear
2) sometimes he doesn't go down 
I don't know how do I upload a video, but he just stays there, also when final phase starts he still just stays there
I got this on android , first one at easy difficulty , second on easy and cracked
About the second I think it's when you time getting hit and hitting him while you're [TITLE CARD]