Nice game! Love the simple yet replayable game loop, immediately reminded me of the game I submitted as well lol

Three things, Simple, Replayable, and Enjoyable.

The game is simple yet the perfect example of a good concept for a time-limited gamejam like this. Easy to implement and completely finish on time especially for a solo developer like you.

In terms of replayability, it has a good gameplay loop that keeps players playing over and over again.

Lastly, enjoyable, it has a fun gameplay loop and good sound effects + bgm and also a score system making the game very playable and enjoyable.

The game overall really feels complete and awesome for a 3 day gamejam, most games I see have bugs and are unfinished but this is definitely finished and fun. 

For future improvement, just improve your speed at developing games, sooner and soon you will definitely be faster, and I say this because there are a few things you could have added that really perfects the game such as a simple pause to see your score after a run, or maybe a highscore system which really makes the game much better. 

Overall, everything is balanced and one of the best games I have seen here, congrats and good luck!