There's so much going on here! This is a pretty impressive amount of interconnecting systems to have put together for a jam. I did get tired of the concept well before I had gotten what felt like much progress, so maybe adding some more mechanics over time would help keep the interest up. There is also something to be said, though, about keeping the amount of content for a jam pretty succinct, since people are going to be playing through many, many games, giving them a short term goal to work towards means they can finish in a reasonable amount of time and leave the game on a high note. I loved how the game didn't really hold you back from picking up tons of speed and air time, it feels great. The upgrades also feel like they're having a tangible effect on the game as well, which is something I don't always see with jam incrementals. Great job!!