Some of the minimalist / minimal color reminded me of A Dark Room, a game about resource management with a similar dark aesthetic. I'm not sure if collecting shells is going to be the main objective of this game, but the exploration aspect was very fun to go through.
I do wish the strikethrough text (can't go back) was implemented further, since it gives some suggestion of paths that can no longer be traversed (especially as it pertains to losing/earning shells).