Create simple timer app for Wear OS (Galaxy 4 watch)

I would like a simple app developed to work on my Galaxy Watch 4, which runs Wear OS. Here's the spec for the app:

1. On app loading, it displays "20" in a large font, centred on the screen and in red colour (see attachment for font size and style of numbers)
2. When the user touches the display, a countdown begins (in minutes, not minutes and seconds).
3. The countdown is in minutes and does not display seconds. Once the countdown begins, the font colour changes to white
4. If the user touches the display, the countdown pauses and the numbers change to red colour (paused state)
5. If the user touches the display while paused, the countdown continues and changes back to white colour (active countdown in progress)
6. If the user hits a long touch on the screen, the counter immediately resets to 20 and red font colour and waits for the next touch to begin
7. When the countdown gets to zero, the watch vibrates for 2 seconds and then the countdown restarts at 2 minutes and counts down to 0. For this 2 minutes, the colour is green, not white like the first cycle.
8. Once the countdown gets down to zero again, the watch vibrates for 2 seconds and the program is finished.
9. App to be accessed as a widget.

I have the files for this app but it was developed for Tizen and I need this ported to Wear OS for my new Galaxy 4 watch. I have attached the project files from the Tizen version. You may want to use the Javascript files already written for this app or start from scratch and code again.