Wow that's a great job there, it did everything I expected it to do.
I haven't done stairs in Construct yet. But in some of my past projects I always had the stairs graphic tilted at a bit of a perspective angle. That way I could just throw down a sloped collision block and the player would run up them normally. It's just an optical illusion, a cheat but it looks good and can save time unless you really do need perfect stairs.