yeah the same happened to my gtmk jam game last year. This time I tried to lean more to the easy side, but as you said, is always hard to playtest properly in these jams.
Your game is solid though, impressive that you did it by yourself.
Viewing post in Blast and the Furious jam comments
Yeah, other years I over scoped but this one decided to keep it small but allow me to create levels to expand it. Worked out much better and meant I could polish it all before actually making the game. I didn't even know what the game was until Sunday. Just had a cool mechanic of driving, picking stuff up, and launching it. Thanks for the comments though :)