Theme and special object implementation were absolutely great! I love the "take your truck and shoot people" sort of game that appeared on the jam.
Although I must say that there were some minor issues with the gameplay, like how the restart button bugs the score and the ice cream flavor display. I also feel like the level is a bit short, I never get to hit more than 7 or 8 people each time. And you should be careful about your music object in unity, make sure it remains the same object by setting the DontDestroyOnLoad property to true, and doing a bit of fiddling in order to make the music play continuously.
But even then, the game remained mostly enjoyable, and the visuals were so beautiful! And I cannot express how much I like the way the tutorial is written, it is genuinely nice to read!
Final rating: 5, 5, 4, 3. 4, 5