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The game looks interesting but can you upload a video - I really have no idea what I'm up for.
A demo would be ideal, though. I don't know how it is for other people but I usually avoid buying games that don't have a demo so I can try them out for myself. The only other thing that could convince me real good I want to play it are lots of good reviews and probably video ones.
But really if as a developer you have the capability to make a demo of your game - that's the ideal case so people can decide for themselves, independent of reviewers opinions or the lack of such. :)