Does the job well! Just a suggestion for the dev to update the app for the new UI change on youtube which has misaligned the speedup icon in the player.

Controlling using scroll and LMB to reset are genius, does what it says, simply good

can't change default speed shift step

Simple and effective

Very simple but very handy.
To control speed hover over icon(left near Autoplay icon) and scroll the mouse middle button. To reset to normal speed just click left mouse button on icon. Fantastic! ))