To me all three have different graphics style, Grey I think yours is more contemporary and easier to look at whereas the other two seem a little more traditional looking which, although perhaps `uglier`, might be more appealing to some people, but your particle effects seem to look better.
Given there are some similarities between them and yet some differences people will just decide what they want based on their personal preferences. To be expected. Some people will choose against your game not because it's bad but because they relate more to the others, even if they others are technically uninspired.
Given there are some similarities between them and yet some differences people will just decide what they want based on their personal preferences. To be expected. Some people will choose against your game not because it's bad but because they relate more to the others, even if they others are technically uninspired.