I LOVE SINE WAVES! I have a notebook full of ideas for games where sine waves are actually the core mechanic!
As for feeling depressed when comparing your progress to past entries, I totally understand you. I find myself there a lot too. But hey, you made it, and we got to see your creation, and that's already a reason to celebrate.
Also, I know you probably already know this, but here's a friendly reminder: growth and success aren't linear. They're more like a series of ups and downs. What really counts is consistency and showing up when it matters, and here you are. So congratulations, really!
Another thing: it's very impressive how you managed to write detailed devlogs throughout the jam. That takes a lot of discipline and dedication, so shout out to that too.