I'm pretty sure I found it through the Godot subreddit.
I made some changes to the game. First of all, I want to thank you for your post. It was a big bust for me to return and finish this game and also to polish it as you suggested. Some of your points I fixed without a doubt, but I want to discuss the others:
1. I think this and some other points are signs that I failed as a game designer I didn't teach you properly about one mechanic - length of the snake. The longer you get the bigger stack of elements you can push. For instance: if the snake has only a head and a tail it can push only a single element. If you eat a dot then the snake will be longer by one and can push a stack of two elements and this thing goes on and on. One of the green levels should teach you that, but I think it is just badly designed and it doesn't fulfill its purpose.
2. Same as 1.
3. To be honest, I never thought you can do that without it ;)
4. Oh man, this was an issue from the very beginning, but I managed to fix it and now snakes body is properly displayed!
5. Shortcuts are fixed - spacebar is "undo move" and r is "restart"
6. I think it the same as 1.
7. Splash screen now is blocked and it is displayed for 1.5s and it cannot be skipped
8. This is beyond me. I use Godot engine and I saw there are some issues with rendering particles that cause this issue.
9. Changed to blue enemies
10. Yeah, I saw that, but to be honest it was very hard for me to reproduce it. So if you know any way to make it happen I would love to hear from you :)
11. Ok, maybe you're right and everything would be more consistent if there is transparency manipulation
12. Yeah, they had an animation that changed their alpha channel. Now I switched to disappear after a random period of time. I think I fixed an issue with wrong path display
13. Changed it to a single sound
14. Fixed
15. Changed as you suggested
16. It was due to some stupid if logic ;) I changed it so now you cannot do that trick but if you hold a button then the snake will speed up to a certain velocity. Moreover, its initial velocity is larger than it used to be.
17. Restart is blocked after finishing a level or after snake's death
18. Fixed
19. I changed buttons behavior so that if one button of a specific color is pressed then all buttons with the same color are displayed as pressed. If a button is pressed and blocked then corresponding doors are opened and blocked. If you unblock color then the button will be marked as released and doors will shut.
20. Fixed. The change will be displayed after the animation finishes
21. I think I fixed this
22. I think I fixed this too ;)
23. LOL ;D
Once again thank you for your time :)
On the one green level where you push the rock down in a straight line then you slither a couple paces left, I just ran into a weird glitch where upon pushing the rock down the line, snakeman kept on moving with no sign of stopping. I tried lettin' go of the down key, and even pushing other keys, but alas, snakeman had some sort of date with destiny. Pressing spacebar fixed it though, because that just undoes whatever move is currently happening. I'm not sure if this glitch is at all replicable though, so it might've just been some sort of fluke.