Generally speaking, what did you think of the game ? Excellent ? Good ? Meh ? Too long ? Too restrictive ?...
I'd say it was fun

But: it did feel a bit long, especially the part where you wait for the predicted date. And the time to submit a prediction was quite long too, leading to the necessity to edit posts.
If there were a second edition, would you participate ?
If I see the topic: yes

Was the rhythm of the rounds (3 days to make a prediction, 2 days of waiting) good ? Too fast ? Too slow ?
Too slow!
What would be the ideal rhythm for the rounds for you ?
A few hours to make a prediction, at random times so people don't get to sleep

It’s been mentioned before, but I’m ok with awarding BTC to the top 3 in each round, though the bonus/malus in the cash shop would be more expensive.
Was the cash shop useful ? Useless ?
I don't think this was used often enough. It was too attractive to keep "saving" for another life, instead of using it to send a malus to other users. Maybe add a 20% "storage tax" on all unused Bitcoin, for each round. So 50 BTC > 40 the next round > 32 the next round.
What kinds of bonus/malus could be added ?
"Take 10% of the final prize money from user X if he wins" (with the possibility to buy "undo").
Which round did you appreciate the most?
The ones I won

Which round did you appreciate the least?
The one where Hypnotizer took my life

Edit or not edit ? Haaaa that’s the big question

.
I still don’t have a definitive answer to this question. Remember, the game has to stay simple.
LoyceVs PM Publisher is a good tool for this game, but that would mean LoyceV couldn’t participate in the game to avoid any doubts. That’s not an option.
Sign a message ? Keep it simple, as I have said

.
Signing a message
is simple

I'd say go for this: Bitcointalk users should be able to sign a message and follow simple instructions.
Is there a website or external tool that could meet the game’s needs (making a prediction in secret and revealing it without anyone suspecting cheating) ?
Even if that exists, you'll get the complication of creating external accounts. I create as few accounts as possible.
Thanks for hosting this!