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The word "unique" doesn't add anything to this. Everything is unique. Why is it unique?

From the perspective of wanting to know in one line what the game is, I would add minimalist graphics and isometric.

As a YouTuber, if this was in my inbox, "isometric" probably would've made me less interested to be honest. That said, when I actually clicked the link to check it out, it does seem interesting..interesting enough I'd like to give it a shot and maybe make a video of it. I don't see anything about price or downloads? You should at least mention that there isn't a way to get it yet if there isn't.

Those are good points. Unique doesn't necessarily convey anything. The main thing I wanted to get across was that the game is very different from other shooters, but I'm pretty sure quite a few other games are the same.

Minimal and isometric are also terms I was considering, since people who've seen it have drawn comparisons to Rymdkapsel in terms of art style. I'm not too sure about mentioning release status or pricing in the one-liner though. Wouldn't that come either in the email subject line like, 'The Light Inside Us-Preview' or in the description?

Sorry for the confusion, I wasn't recommending you put availability information in the tagline, I was asking about it because I want to try it.

Second this. You need to describe why it is unique instead of just saying that it is unique.

I learnt it the hard way in the past :D