PacMan, the bane of my Qwen(s)

I'm testing out Qwen 27b 4K\_M and Qwen Next NVFP4 locally on Deepseek harness, and no matter what tweaks I make to instruction or compaction management, they never seem to be able to finish the following taks: "please build a faithful pacman clone that can run in a browser. Do you use external files from internet for reference, but build and test it before delivering the final product. You are on a limited token budget so make sure to delegate small measure sub tasks that can be made by sub agents and committed to workspace before context runs out." I have limited context (95K on the 28b and 65k on the Next), and with the next it does not get into loops, but designing the maze is always the never ending stumbling block for it. It keeps thinking and rethinking the layout and never get to a finished MD file. Can anyone make Either of the Qwen actually finish a faithful PacMan? And if so, please put the specifics for model and harness used (Model Quant, KV size and quant, Harness). I'm really curious if something obvious is holding me back. I don't want to handhold the model or give it too many specific in my prompt as, as it is a model test and not because I really really need a PacMan game.