Love how you used the theme, game could use some instructions however - I thought I was supposed to jump over the Cacti for a while. I'm also not really sure how you earn cool points other than going really fast and then stopping, some text above the screen would be useful.
The art is really nice, and the gameplay, while simple, works effectively. A little unfair, but random spawning can be a pain to do so it's understandable (to me at least)
On a quick side, your personal attitude is excellent. You've said this is your first game jam, which is impressive and a great achievement. I strongly suggest you make another project using your attitude, but making it about a universal experience, such as work. You'll do wonders with that