It looks great on that screen shot but wonder what it would play like on the 2600 with only 1 fire button. Even the NES controller had to use the select button as an action button for controls on this game. Also I bet the animation is pretty bad as well but can't tell from a screen shot.
Late in the 2600's life Atari released a BOXING game in the red and black cart format. It was a VERY,VERY good effort for the 2600-the boxers were seen from the side, you could select three different fighters and there was a bell, ring, crowd and everything. It made Intellivision boxing look sick, and is likeley the closest the 2600 will get to a one on one fighting game aka Street Fighter 2.
But 80% of PUNCH OUTs appeal lies in the power of the NES carts, with detailed graphics, SUPERB animation of the fighters... in a way this is a looking-forward STREET FIGHTER. The 2600 can do good cartoony graphics like Pitfall 2 and Seaquest, but it could not come CLOSE to Punch Out. You would lose Soda Popinkskis bottle drinking, the TIGERS tigerskin, the bandage on King Hippo! You would lose the CHARACTER that MAKES this game so fun!
Now, a 7800 cart....it's possible, except the sound/music!
I can read words, so TELL me, are the PUNCHOUT sprites on 2600 really big, multicolored with facial animations? Again that is what makes punchout great, the CHARACTER HUMOUR. Without it you just have a fair boxing game.
It's like SMB without any hidden rooms or warp zones. It's playable but most of the motivation is gone. Why not do a 2600/ NES translation that would WORK like GRADIUS?! Or better yet the Gameboy Super Mario Land showed us you can have a FUN low resolution SMB! I'd love to see SMB on the 2600, maybe using Pitfall harry..Super Pitfall Brothers!