I finished something old, something gold and had a good time with it, even though the gameplay is rather limited.
The things that shined most for me were the visuals and sounds.
Sadlilbirb chose a good palette and made good use of it too, keeping the sprites simple and clear. The sounds were also minimal but I feel like it captured the gameboy feel very well! In general, this game feels like a true gameboy game and it adheres to all the limitations of the Jam, as well as does a good job in portraying the second theme.
The game itself is rather short and the fighting at times feels a little clunky. Like I said though, I still had fun playing this game and would love to see where, if anywhere, it goes in the future! The UI was really nice though. I like that you didn't need bullets for the gun but you did have to wait for the reload. It made combat feel a little more interactive. The fact that skeletons blow up when you beat them with the hookhand was funny but felt hard to avoid sometimes.
All in all, good experience and a solid base that is commendable for spending only ten days on it. Well done!