maybe a lily pad that you can only place over a water tile (when replacing it) or a tree sapling that grows after some time but has to have sun and water all the time while growing, a composter would be also cool, just like water that doubles the points but it has a greater range
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ooooh, Those are some really cool ideas! I'll experiment with some of the ideas on paper. But I'm not sure if it would add the wanted complexity, maybe it would, but I was maybe thinking of adding a threat. One that could setback the player or force the player to react in some way. Either way though, I like your ideas!
yeah a threat like fire spreading would be cool, but for this game I think the threat should be more of running out of space or making a perfect setup that makes more points with the fewer time. I think the score system could be changed a little so you don’t just remove grass to and then place grass on that same space again infinitely