This game update to version 1.0.5.15 fixes the issue of the Continue button disappearing when you exited the game on the Hardcore difficulty level.
More updates coming soon.
Thank you for your continuous support for Project Warlock! Please leave a review if you enjoyed the game - it really helps us get more visibility.
https://store.steampowered.com/bundle/26638/Project_Warlock_1__2/