Damn dude, I am loving this. Such a charming aesthetic and the gradual introduction of game elements is very fun. I didn't know what the yellow tiles meant though, if anything. Overall, I'd love to play more of this.
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Thanks for playing! Yellow tiles were supposed to be sand, used for visual interest (I probably needed other purely visual tiles or to stick to only special ones)....
Now I'm trying to think of what interesting rules sand could (should) have had... maybe a sand tile cannot bridge to another sand tile.