Hi :) Thanks a lot for your comment and the suggestions!
When you say 'more active' , do you mean 'last longer and/or come back a few times' ?
If it's what you mean , maybe I can answer all of your suggestions at once : I thought a lot about the difficulty of the game and what I wanted the duration of a session to be.It's a jam game, so I had to be simple and quick, and I wanted the game sessions to be quick and challenging, so I tweaked a lot all the aspects of the gameplay like the respawn time of the tombs , speed of the hunter and the ghoul, health , and stuff like that. In the first iterations, Tombs were not destroyed when digged ,life returned, and the alert was here for all the duration of the session. And playing it for a while, I thought that the game was becoming too easy too quick, so I deleted the alert, made the tombs breakable and life loss definitive, and finaly add the alert again but just once in the begining .
At the time , and with the objective of short sessions , I did not think that a save option was necessary. But I'm working on an other little game at the moment, and save will be needed, so I may come back to this game and add it too. If you think it's useful , maybe other people would agree with you.
All of your suggestions are leading to one possibility, if I work on the game again , I may add difficulty levels, maybe an easy or normal mode with more alerts and life returning when reaching a certain score, and maybe a difficult mode with no alerts and definitive health loss.
I hope my (too long) answer covers it all !
Cheers !