Don't be sorry, you did amazingly for a first game and errors happen to everyone. We're all rushed during jams and have to cut corners. The most important part is actually submitting a game!
I'm also not a native speaker and you won't believe how many stupid mistakes my editor has to catch because of that :)
Now that the jam is over, you have all the time in the world to change whatever you aren't happy with and expand the story as you see fit.