Already downloaded the latest update from January 8. It is an AWESOME take on Burgertime, certainly better than M-Network's version for sure!!! I have saved this thread in my "Atari Forums Sites" folder. I played it and then compared your version vs. the original M=Network version and found this one to be far superior. As for the flickering, we longtime Atarians have known for decades that the 2600 can have only 4 objects moving in different directions at the same time without flickering, but I can deal with that, I guess the original Atari 2600 version of Pac-Man from 1981 taught me that decades ago.
This one (and Pac-Man 4K and Pac-Man Arcade, both available from AtariAge, along with the brilliant 2600 redos of Tempest, and the great Yars' Revenge) are definitely reasons for me to just ditch the VCS adapter for my 5200, and just get a 2600 Jr. (preferably the short rainbow version, provided the silver bezel is in top shape) again, and have it a/v-modded but that leaves question of whether or not to keep my 5200 as it has its own great games (I have TONS of great titles on both my Atarimax 5200 multicart and my Harmony Encore 2600 multicart).
BTW, I know you named it (and the title screen gives it away) "Chaotic Grill!" but I changed it on my SD card to "Burgertime Arcade" because of how arcade-like (for a 2600) it looks (and plays!)! Much better than M-Network's OG version.