JGgamess said it perfectly — sometimes the simplest games are the most enjoyable, and the "just one more try" reaction Friendlybite had says everything about how well the core loop works. Ghost Icon Game Studio's point about the controls being well-balanced — not too fast, not jumping too high — is the kind of feedback that shows the game feel is genuinely solid. The playable menu RafaelDev77 called out as a creative touch is a really neat detail that most jam games skip entirely. Tio Celso's jumpthru suggestion for the platforms is worth implementing post-jam, and a scrolling background like CLEDU mentioned would add a lot of visual depth without much extra work. The fact that this was a long-held idea finally getting its proper jam is a great origin story too!
Feel free to check out my sky platformer too if you get a moment!