Fun start to something here! The flamethrower is fantastic. I agree with Chipper about placement and waves (this could be because I played the web version.) I look forward to playing again if you update after the jam.
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Thank you. Plants can't overlap, so they can't be placed on top of each other. Spiked bush is an exception, because it's kind of the purpose of the plant. Enemies don't attack it directly either. Web version works exactly as intended, only problem seems to be the water shader. Correct behavior would be reflecting everything above it, just like in the windows version, but for whatever reason it's a solid color.