Okay! Let's see here... so, first off, this looks pretty spot on to like, say, a minigame on gameboy. Which makes sense, seeing as how it... is a gameboy game. Like this is actually a gameboy ROM. Suffice to say, you're winning points from me on the "gameboy soul" thing, outside the lack of sound this feels like a minigame I could actually end up playing as part of a real gameboy game.
(Running on actual gameboy is just a small bonus for me on that, to be clear. I'd be giving a pretty good score on that category here either way.)
...does bring me to an unfortunate issue: This game has no sound at all whatsoever. Which, for what it's worth, is probably better than particularly grating sound, and I do understand that like... I mean you made an actual gameboy thing here. That's not as easy. Y'know? I get it.
Gameplay... is functional. It's a basic game of whack-a-mole ultimately, but hey, it does work for what it is, it's fun enough. The visuals do have a slight mood to them and a vaguely spooky aesthetic that gets the job done but feels more-so like a reason to award well in graphics than a reason to award well in theme.
I might further fine-tune my thoughts as time goes on but for how short and simple the game is I'm kind of surprised I was able to say so much about it, so suffice to say I think you probably did something right here. I had a good time!
(tl;dr it's fun for the visual charm, but has no sound and the gameplay is just ok. I had a good time overall.)