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"Despite being showcased on various trading shows and completed for release" should be changed to "Despite being showcased at various trade shows and completed for release".
"players" should be just "player" as this is a single-player game.
I use "players" in my writing to refer less to multi-player and more to refer to the people who may play the same. I think it's more of a stylistic choice than anything.
The last two sentences in the second paragraph should be connected , ie "both the United States and Japan, however it was left unreleased". Should also change it to "was never released" as I think it flows better.