Hayfever is a wonderful indie game on Steam. here is a guide to help you find all locations of hidden secrets in the game.

Go down through this narrow opening in the thorns.
Follow the titular red rail to the right.

Use the rainbow power-up to go straight up along the wall.

Wait a bit until this flower has spit out a long trail of clouds, then use it to go up.

Use the rainbow power-up to go up along the wall to find an opening. Follow the path through the opening.

Get on top of the platform above by using the balloon power-up and the red balls thrown by the scarecrows.
Use the balloon power-up to fly further up.

Go past Carlie and jump down to the right.

Use the balloon power-up to fly straight up past Carlie, to an opening on the left wall.

Land to either side of Carlie, and follow the upward arrows.

Fall through the opening on the lower right corner and continue to the right.

Enter the suspicious looking block on the right wall to get a sneeze charge. With three sneeze charges, jump up to the low gravity area above Carlie.

Use the rainbow power-up on the lower right side to fly straight up.

Use the sticky power-up to stick to the ceiling and follow the wall upwards.

Go through the small opening in the wall on the left side.
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