I developed a game solely as a Telegram bot: https://storebot.me/bot/mrw_bot
I think that this is a better platform than mobile as it supports multiple devices, user accounts are already setup, it's easy to test and it has built in notifications.
One thing I did have an issue with, is showcasing what it's features were. One option is to create a lot of videos and screenshots which would take a lot of time. As further improvements were made, I would have to reshoot the videos.
Instead, I created a React component to simulate interactions with a bot. The React component is here: http://sevenleaps.github.io/chat-template/
The website for the bot is: http://www.mrwgame.com/