Sure thing. I think ill do a little explaining for those who find themselves in a similar boat. So the first digit has to do with symmetry (a number that can be folded both ways and still look the same) so your options are really zero or eight. the second hint is specifically referring to a number that when split vertically in two looks like a new number so if we look at our numbers for slot one, eight is the only one it can be (creating three). the third digit (probably the one that confused the most people) was OUR sum (cryptically referring to the sum of all the characters, AKA being "stronger together") so all you would need to do is count up the characters (including Piko) totaling six. The final digit was a reflection of the first and eight being symmetrical is also eight. I wanted to make sure you got your answer (and anyone else looking for one) without it being easily spoiled. and if you find you have the time I recommend playing the game all the way through as there is a neat little ending scene :) (i was a little bummed people weren't seeing it because we made the puzzles too hard)
Okay, I was thinking of numbers for their values and not the shapes. And yes, I think the third one seems like bit of a stretch, I was thinking this in terms of sum of the (other) numbers too. I was kinda close too when I tried to start and end with eight based on the last hint too but was still going wrong with thinking the second would be half of the number and not visually half of it. And obviously third one too but would have come to correct one on this since I tried to loop through the whole thing.
So basically my solution of 2185 was completely correct but just thinking from different angle. So it's kinda like if you give a math student a test where they need to solve a quadratic equation but only accept one of the answers.