First of all, great idea with the pipe connection system. I loved the games back in the days and I love em now. It kinda threw me off that the cats made horse and cow sounds but besides that good little game.
Even tho I didnt were able to come past lvl 4 even tho i think I did solve it? It didnt go on. 
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Hi, thanks for playing :)
And yes it's the cross pipe that I didn't have time to finish properly: as I put under the game, it's meant to go only straight (like, it can go from left <=> right and top <=> bottom, but not for instance left <=> top). I realize that I should have removed it since it's so unclear, but not sure I'm allowed to edit the game now, even for such a trivial thing.
As for the cats, I lacked time to make proper obstacle tiles so they're basically my placeholder for obstacles. And you're not supposed to click them but you found the Easter egg, congratz :D