it is the health bar. I kinda made it hard to understand : ) but when you touch the enemies or the boss's snowballs you will take damage and health bar will go down. And there are some hidden medkits that give you extra health.
it is not a bug. I just wanted to make counter and after that I realized that I could make like you said but didn't have time:( And the thicc grey "platform" is void. That's why you die
I liked how you can kiil those enemies by rolling a dice. I think you could get better rating next time by making a main menu screen and adding some visuals that fit the theme. Audio could also be more interesting. Good job!