use skulls instead of gems

assets/sprites/skulls/yellow.png.import

@@ -0,0 +1,34 @@
+[remap]
+
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+type="CompressedTexture2D"
+uid="uid://fw01lg2olk7f"
+path="res://.godot/imported/yellow.png-b1e27f543291797e145a5e83f2d9c671.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://assets/sprites/skulls/yellow.png"
+dest_files=["res://.godot/imported/yellow.png-b1e27f543291797e145a5e83f2d9c671.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
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+process/hdr_clamp_exposure=false
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