Games on telegram aren't popular here, so it is difficult for you to market it here even if it is free. because at the beginning of its appearance, Telegram was already considered a scam field for crypto users. If I were you I will try to build the website like others, this is one way to build trust here. Even if your intentions are good, and have the output to create a real cryptocurrency game, but one thing you should know is, the people will play your game if it really makes them happy, not the fear to be loss.
Honestly speaking it would be a turn-off for many since it requires downloading the app and like you said, scams galore.
I think most people here use telegram (no need to install it even as you can use it on web and registration too is easy), it shouldn't be of trouble.
Regarding game, it seems bland, you can keep guessing same answer and you will eventually win, I won thus, however I have no idea how to proceed with bonus
[1] !? Also, I dislike how it clears previous games.
[1]
https://www.talkimg.com/image/GWwvd