Version 0.4 works for me on Windows 7, but not Windows 10.  On Windows 10, CD version, all other modules disabled, I get:

Failed to load WormKit module wkGhostReplays.dll: Error 0x0000007E

Not sure how to reliably get a ghost to play back. Sometimes it works, sometimes it doesn't. Not sure what I'm doing wrong. Ideally a ghost would play back every turn automatically without hotkeys needed.

I suggest altering the functionality as follows: instead of using a hotkey to manually trigger recording a ghost, each turn should automatically be cached and after the run you are given 5 seconds to overwrite the previously saved ghost (if one exists) using a hotkey. Reason being, often you start recording only to fall 3 seconds later, and your old ghost replay is now gone (or at least not active for playback anymore).

My main issue so far (if it's working as intended) is the module is just confusing. I suggest adding more text at top-left to make things more transparent/easily understandable. The text is unobtrusive so there's little harm in adding tons of detail, at least for these test builds:
"Recording..."
"Playing ghost #X. Press Backspace+Tab to reselect/cycle active ghost. Press Backspace+L to always play the previous turn's ghost"
"Error: No ghost found"
"Error: Module stopped working: restart WA to fix"
"Ghost recorded to temporary cache. Press Backspace+Enter to replace active ghost for playback, or Backspace+N to archive as new file. (Ghost will be discarded in 5 ..  4  ..  3  ..  2  .. 1 (countdown))

I used different hotkeys because Ctrl, Alt, and nearby letters are often used in RemapKeys.. however my examples might not be ideal either.

This is after limited testing... so my confusion reflects that..  my computer is broken currently and won't boot >:\  Will fix and try again later.

Ty masta! This is one of the most fun and promising wormkit modules ever, IMO

Finally got a chance to try this. It's great, I love it, lots of fun. Too slow you say? There's no speed limit LOL it's super fast. The physics are great, and I like how falls are quick and painless. Just need more levels.

IT WORKS!

In general you can take a screenshot with the Pause/Break key, and it's stored in User\Capture. Works in unmodified frontend and in-game.
Using SuperFrontend you only get a 640x480 portion of your screen though, so it won't help you in this case.

I recommend GreenShot. It's free and works great with SuperFrontend. https://getgreenshot.org/

Same as rUn4w4y: The testing module works (worm shows up) but Ghosts folder remains empty. This is on Windows 7, CD version, 3.7.2.1

Game hangs every time after round ends- black screen with nothing but Test and the worm below it,  must kill process in Task Manager with Ctrl+Alt+Del to exit.

Tried with and without other WK modules - same behaviour in both cases. (I thought game hanging on black screen might have been caused by lack of d3d9wnd but it isn't - it's caused by GhostReplaysTest)

Tried also on my Win10 PC - WA notifies on startup it failed to load  wkGhostReplays.dll

Which version of the game is this for? I'm using 3.7.2.1 CD version. Maybe it only works on the Steam version?

Also I assume you're supposed to press Ctrl+N during your actual turn, but can you also press it during a replay, so you don't mess up your run?

Race mode is amazing. The AI is already godly at roping.. you'll probably want to add a dumber one for noobs. AFAIK there has NEVER been an AI that can rope before - very impressive. The game handled my .png map flawlessly, and the start/end position and turntime counting features are wonderful. Love the ghost and zoom features. Still getting used to the physics but they are pretty intuitive - glad you reversed the upside-down extend direction.

For long races, I recommend adding the ability to create checkpoints

You could add a "practice" mode/checkbox where if the frog drowns during a race, he gets teleported back to the last checkpoint. (Similar to WA's "antisink")

After a race ends where the player successfully reaches the finish line, it might be good to ask "do you want to share this map and your ghost online for others? I certify that I own the required copyrights etc".  Then we could race against other people's ghosts, have things like a leaderboard, daily featured map challenge, etc, even if nobody else is online. Asking after the game would help ensure map quality, correct start/end/checkpoint placements, and overall playable/bug-free.

It's really incredible what you've accomplished in such a seemingly short time..  keep up the great work!

This better not be Rope Clash Reborn. We don't need more of these atrocities.

Otherwise, it looks good. Keep up the good work.

Rope Clash kicks ass. Did you ever even try it?