The grandpa character looks great, and his dash is PERFECT! :D Grandpa's voice acting is also very nice. :)

The chill music almost seems like an odd choice, just because I feel like if I'd seen this game made by someone else, they would've used music that was more frenetic/frantic/stressful — which, admittedly, would also fit — but you're just a grandpa on his way to the supermarket; you're in no hurry, so I feel like the chill vibes are actually a great choice. :) I also feel like it helps soften the blow from frequent Game Overs, making them feel a lot less stressful/devastating when you managed to get a huge score (at least, it does for me). I think the music choice makes this game more unique, too. I like it! :)

Using a newspaper — a standard-issue item for old men! :) — to shield yourself from the occasional gangsters' fire is a nice touch as well.

The sunset background is also quite a nice cityscape, showing the rest of civilization off in the distance; reachable if only Grandpa could go westward… But the supermarket's just across the streets; I'm sure it's not too much farther…! :)