This game was so cute! You definitely stuck to the theme well. The art was adorable, you and your sister did an amazing job! The film grain was a little heavy, but it gave it a cool retro vibe regardless. The spikes had a hit-box that was hard for me to get the hang of, but that might just be because I'm bad at video games lol
Overall, for your first game jam, I think this is an excellent and adorable game!