Thanks so much for playing and giving feedback. Very helpful. I can see I need to work on accessibility. Is it mainly the moving pucks (squares and rounds) or are the holes (squares and rounds) too similar as well?

I wonder if the squares didn't have such rounded corners, would that be enough? If you or anyone else has ideas on this, i'd love to hear them. I'd rather use shape / texturing over adding additional color but let me think on this.

It is just my point of view, I have no difficulty to differenciate the holes shapes (circles and squares).
My difficulty is to see the difference between the rounds and the squares on the one hand and between the squares and the other square elements of the game on the other hand.
So I think if you change something on the squares it will be enough. Maybe if you fill the squares with hatching.
I don't think to not round corners of square will be enough.
I have noticed that in the first SiNKR the moving shapes were a little smaller than the elements of the game.

I hope that can help you a little, sorry for my bad english :P

Good luck with your game, I will wait its release patiently.

Ah! Thank you for the clarification. I think I understand now. Your English is quite fine, I just made some bad assumptions. The issue, as I understand it now, is that the square moving objects (I call them pucks) are the same shape as the stationary launchers (I call them kickers). The kickers have a triangle indicator to show direction but when they are gray (cannot rotate), they do look very similar to square pucks. Changing the kickers from square to triangular might fix it. If that looks too strange, I could try hatching or inscribing a square or triangular outline around the kicker direction indicator. I'll give it some more thought. Thanks again for the help.

PS
You are correct about the original SiNKR having smaller pucks, I made the pucks larger in SiNKR 3 because I think that looks better, especially on the diagonal. When I update SiNKR and SiNKR 2 with the new engine after the SiNKR 3 release, all three versions of the game will have similar looking contraptions, so I do want them to look good and be easy to differentiate.

I decided to make the puck and kicker size difference the same as in the previous versions. Thanks for pointing out that difference. Here is a screenshot. I'll post an update to the demo next week. Thanks much!
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2610324329