Congratulations on for your first jam! The art direction is my favorite part of the game, it feels polished.
Some constructive criticism would be to make those jumps a bit more forgiving. I'm not sure if there's any further content beyond the first level because that final jump before the red crystal is incredibly hard. I was looking for the quick animation change when the character begins to fall before I jump and even that was not enough to make it. That level of precision does hamper the fun for me.