Footjob not currently planned as a feature.
Itch currently does not support downloading HTML browser game, will enable if they do in the future.
If it does not provide download support ... then it really looks like it is not possible to run HTML games offline. Anyway, stay well and continue with your great work.
Without wanting to be boring, but could you give me any tips on how to start making drawings relatively well? or where should i start? I always get a little lost.