Because my game only uses one save slot and I want it to load automatically when I start it.
Sorry if it feel harsh, but it's two reasons for me to not play your game.
Your game will not be good and interesting enough to justify such behavior. Not that I expect your game to be bad, but a game need to be exceptionally good and interesting for one to accept playing it under those conditions. And if there's really good and interesting games available on the scene, none have yet reached the "exceptional" level, and I don't expect one to do it in the future.
What mean that people will play your game for its entertainment value, not for the challenge it can possibly represent. Therefore, it's the kind of restriction that would make your game less enjoyable, and so less played.
This being said, using a combination between
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and
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would probably be better.