Hi, sicave!
I updated the game. Now, when the game starts on easy difficulty and the player dies, you can restart the game and respawn at the last entry point to the location. But all resources are lost. Devlog: https://konstantinfedorov.itch.io/kayuk/devlog/734408/update-may-20-2024-adjustm...
Restarting on some non-current level will broke storyline - for example, in some activities doors are locked. So restating is implemented on current level. Drawings and installed updates are not lost because player can die in boss fight and battle with default weapon can be... painful. Resources are not so important but still needed for the upgrades buying or as one of the main story walkthrough.