It's going to be a while before I can get all this implemented, but I've updated the itch.io page of Worlds Within Worlds to show the list of currently planned changes for v1.2.0;
https://bluishgreenpro.itch.io/www

Here's the list if you want a quick look, but unfortunately the formatting didn't copy over to SRC;

Speedrun Menu Options: Added a new Menu with the following options
Timer: You can enable a timer and set it's position between Bottom-Right, Top-Right, and Top-Left
Use the "T" key as a shortcut to toggle this
Speedrun Mode: Clear the fire in the Level 1-1 2nd screen to make it easier to complete without the butterfly and shows Best-Times for levels (see below)
Use the Number "9" key as a shortcut to toggle this
Enter / Exit Level Button: A dedicated button to enter / exit levels; "Shift" by default. You will not have to hold the button down; just press it once to trigger the transition.
Drop-Through Platform Control Option: Tap "Down" to drop through platforms without having to press "Jump" as well

Individual Level Best-Time Tracking: Your best attempt at clearing each level will be recorded and shown above each level's gate in the overworld with Speedrun Mode enabled

Quick Erase Progress: Erase all progress to make a fresh run at the game; Number "0" key or "R" while paused

Bug Fixes;
The cursor no longer remains invisible if you pause or reset the game while the butterfly is active
The in-game timer no longer counts frames to determine time passed and so should be more accurate
Fixed randomly instantaneous level transitions