Sorry for the late reply; have not been checking my itch feed too often recently since y'know, it is not expected that anything important would enter my inbox at this time period.
Here is my answer though: Late submissions in general is an exception not the rule. In this jam it is mostly for those who would have submitted on time otherwise but due to some unforseen circumstances failed to submit -- and thus it is only open for a reasonable time frame and after enough communication with me beforehand. And thus, regretfully I will have to reject your submission this time.
There will likely be another jam in August, so if you are still interested in joining this jam, consider preparing for it -- perhaps joining the discord server and learning more stuffs in the next 5 months.
As for the rule for video games only, it is mostly to clarify that unfortunately this jam does not accept TTRPGs. I am not sure exactly what kind of interactive fiction you are talking about, but visual novels and text adventures are still accepted (altho the latter will probably not receive good ratings unless it is really, REALLY impressive).
In any case, although this time I cannot accept your submission, be proud that you made something regardless! It by itself is an achievement.
Have a good day.