The health bar is not displayed correctly at values other than 255
150 is not a valid value with the way the health bar/lives work in the standard kernel - it's not a linear 0-255 value, it's binary. Check the batari Basic docs for correct usage:
https://www.randomterrain.com/atari-2600-memories-batari-basic-commands.html#pfscorebars
I'll look into adding blocks to make it more straightforward to control.