This game is so good! I love the pixelated art style, and I think the premise is super fun too! It really reminds me of the Gamer minigame from "Game & Wario". I really dig the way you incorporated a timer into the actual game setting as well. It's really clever!
I think one thing you could possibly add in a future installment is some kind of "boss detector" just so that players can have a sense of when the boss might come around. I think another way to get around this could be having the boss only get angry when he LOOKS at you. This way, you can keep playing the video even if the boss keeps walking around in front of you, but you'd need to watch out for whenever he might stop and snap his head to see you. It could add a lot of layers to strategy and risk-taking, and I think it would make the game feel a lot fairer as well!
But other than that, I thought this game was great! I loved the very cutesy aesthetic. :)