You should’ve added a link to a resume, a github profile or other external resource listing your info of some sort that you could update at any moment, it’s a shame that you haven’t thought about it in time.
Also, I don’t want to sound offensive or anything, it’s great that there are people who are willing to help the project development ASAP in all ways possible, but probably if you changed your mind about what exactly you’d like to do in just a few months, you weren’t so certain about being strong in that particular field at the time of applying, which you think now changed a few weeks or months after applying. My point is, chances are you are still not that experienced in the field to apply for that field (there are just too many really experienced people who are doing their stuff for years and years already to compete with), so I wouldn’t worry so much.
Also, Facepunch are probably only gonna check out these applications once they feel that they need a person or two helping to handle lots of work in a particular area where they can’t handle it themselves, I’d imagine them looking through a particular category of applicants (programmers, modelers, mappers, etc.) to find the best one or two people and contact them.
I applied myself but I don’t expect my application to even be seen at all, not because I feel like I’m a bad programmer or anything, that’s more of a question of Facepunch ever seeking for a developer in that field and not finding someone directly so they’d need to actually look through these applications.
Also, there’s a chance that all these application form shenanigans were created just to avoid at least a part of all the “PLEASE HIRE ME I LIKE S&BOX SO MUCH I CAN POSE RAGDOLLS REAL NICE” shit, but maybe it’s just my imagination (that’s what I’d do :D).
A bit off topic, but it’s more of a message to more people worrying about their applications looking very nice and being sent in time and being super fresh and relevant.
Just be the best candidate out there and if there will be a perfect job for you and you will want it, you will probably get it regardless of your application form, improve your skills, show off your work, you won’t be missed.
Best wishes to everyone and don’t worry, you’re good!