I had a hard time distinguishing between the next level and new gun squares, but that's probably just because my color vision sucks lol. Still a fun and simplistic game.
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Actually, I just looked at the code and I noticed that my game first checks if a tile contains a gun before checking if it is the end when drawing and as I know I don't check if the tile is the end when placing the gun's in the map it may just be that you had a few times that the end tile was drawn with yellow rather than green.
Anyway, I'm happy that you enjoyed it :)