Thanks for your feedback!
To address this, the game is still early in its overall development. A save system is planned to come with the first major update, which is coming this year. Likewise I am planning a combat rework at some point. The plan is to allow players to free aim where their cursors is pointing, but I will also look into improving other parts of the system!
As for the keycard, there's no red keycard yet. You may have noticed there's a note that says you reached the demo end under the dairy. More content is coming in the future and eventually there will be use for it. Likewise areas like this vault that requires said keycard will be reworked to offer a new type of content to make it worth players' time.