Pros
- Very nice graphics! Really cool pixel art!
- Very fitting retro music!
- The game was short but challenging enough!
- Well implemented mechanics and gameplay.
Cons
- I guess it would be unfair to state cons considering this is your first game ever. My only advice would be to follow the jam theme since game jam themes are really important. But this is your first project and also your first game jam entry so it's understandable!
Overall: great work on your first game ever! I hope you keep on making more games! Making games can be quite difficult and takes a lot of time and effort, but ultimately it's a wonderful experience and you learn a lot. Congratulations!