Other suggestions that may help:
Player online: Display the average number of players currently playing online on the initial page (if possible).
Other fee options: 50 sats, 100 sats, 150 sats
Adjust: When the system is unable to pay automatically, it prompts you to add a Lightning invoice and request a withdrawal (nothing wrong here).
The problem: new players might get a little confused about the time
The sats will be sent exactly at the end of the countdown?
Does the user need to keep that countdown window open until the countdown is finished?
Will the user still receive the sats if they close the pop-up before the time runs out?
Just a short text can resolve these issues.
Aside from that, I'd like to congratulate you on the project; it's very interesting and funny
