Opencode side scroller game

I have the Qwen 3.6 coder model working in Opencode on a side scrolling game.  The code is here https://github.com/mattdyer/side-scroller.  We'll see how far it gets.  I installed a goal extension in opencode, but it doesn't seem to be working.  It is supposed to keep running the model until the goal is complete, but so far I have to manually keep re-running it.  In the repo you can see a PLAN.md.  I have a goal set to implement all the steps in the plan.  The model sees the goal and keeps working on it, but it just stops every hour or so and I have to start it again.  Progress has been pretty slow so far.  I might try playing with some of the settings for the goal plugin and see if I can get it working.  Here is the plugin that I installed. https://github.com/prevalentWare/opencode-goal-plugin  Maybe there is a better plugin that I could try.  I'll look around.