Its okay if you don't have a full time job, I'm sure they understand that not everyone here is able to get full time jobs, at once at-least. As long as you find some job, it could be part time or full time.
Its just that you should be able to help your coming spouse in some way. They don't want to bring your spouse to Canada and not being able for him/her to live well.
I don't think they care whether the job is full time or part time. They know it is hard to get full time jobs. Don't worry about that, just send them what you have. They can see you have been trying. I know of people here who have been working for years through Agencies part time jobs, for some reason or the other they are not able to find full time jobs. So don't stress on that. You should be fine and trust in the Lord.
Coiler