how long until claude can actually be pointed at a more complex project and just port it

i tried porting a love2d game using claude 4pus and an agent that was even slightly more complex than just "two screens" and it died after eating $20 on a key and giving me an approximation of the room loading code and player movement. it didn't even finish porting being able to shoot and i had to keep telling it to actually look at the code instead of riffing.
i like the idea that i can just feed videogame code into it but i wish it worked better for complexities