i know the counter is big, its not meant to be a useful implementation, its just meant to demonstrate the adder circuit
here's an example of a way smaller 8-bit counter (that also outputs in SPRK) made by me: id:2564707
i already upvoted a while back ago :D
that 4 bit counter is H U G E lol. and it's also counting in the wrong direction, it's supposed to be counting from right to left, not left to right. you could try to make the counter a bit smaller... but all the other electronics are awesome, +1