The game has an interesting glitch. If you dash towards a wall (by eating a bat), and you press bounce exactly 1 frame before hitting the wall, you will bounce upwards instead of dashing down. This is a frame perfect trick, because bouncing one frame too early or too late will make it to fail.

Note: the trick is easier to execute on lower framerates, because you have slightly higher time to react and do the bounce before hitting the wall.

The trick is not viable at all in full-game runs, but can be used to save time in some ILs (like level 7).