It's absolutely not as good as Sivion ZZT. It's TOO SHORT, has weak gameplay with too little interaction. Graphics and sounds are good, but a game like this should be MUCH better. A pity it's not finished.

Just a note to previous reviewer - the final release of Sivion was never intended to be played through as a game. It was scrapped and everything was released so people could pick through and use the code and ideas for their own games.