Build 26508016

Bug fix:

• Fixed bug when alt-tabbing from the Inventory.

QOL changes

• Added a modern checkpoints system.
• Added a message when encountering the 1st enemy locked room.

The bugfix was introduced due to the Steam overlay requirement added right before launch, I didn't test it enough. The locked room message is the least effort fix, those locked doors should really have an icon on them, but I wanted this out ASAP due to the alt-tabbing bug and graphic changes takes me hours pixelating.

The checkpoints were long overdue. I added it as a togglable menu option not to break anyone's saves. There is no penalty in-game for using either save system, it's not considered the "easy mode" or anything, it just is there. It does make the game easier though.