The writing wasn't as bad as you made it out to be, even if it is a self insert
But at the same time, aren't most VNs?
I think its awesome that you put everything together in MMD and used so many expressions on the model - I haven't used MMD so I'm not 100% but I suspect it probably took a while to compile all the scenes and everything, so I think it deserves credit.
The fact that you put all this together solo within the jam timeframe is impressive, so don't hesitate to reach out to other people for the next one, more hands makes light work, after all. But good job, regardless! Hope you can come back to get in the missing images and fix any issues after the jam is done!