Aye that guy's the first boss of the game(and the end boss of the first stage), there's 4 bosses in total and two of them have stages. You might have been shooting his teeth(which I gave a seperate hitbox that did 0 x damage), your comment made me make all the "deflect" areas at least do a bit of damage(like 0.5x) at least and I changed the health values of the tougher enemies slightly just incase it was that instead. The deflect areas did have a "tell" but it was pretty inconsistent and a drip in a puddle so to speak with everything going on in the screen, sorry about that.
( I definitely neglected giving this game to other people for testing as being part of the development process 😵💫, thanks for the feedback so far man. The patch is up if you wanted to give it a go)