Hi, I recently launched an app that might help. It involves a repeating interval timer where you try to get a task done in a short amount of time.

- you can have task streaks, add quick tasks, unlock items and collect cute animals.

- you can set the interval timer to 1, 5, 10, or 20 minutes.

- Play for 20 consecutive minutes (at any time interval) to get the most rewards.

- Have different themes to motivate you.

http://www.deadlinesapplication.com/

I talk about it more in this post:

https://www.reddit.com/r/SideProject/comments/fw5l53/another_productivity_timer_app_based_on_short/

If more people get interested I would continually add items, animals and a special adventure mode.