Thanks for the feedback. I think the time I've spent on it now that I realise is just over one month. It's felt like a long time lol. About the plagal iv-i cadence ending the first movement, I was trying to avoid being 'cliche' there with it. I'll write a coda (most likely in Presto) to it in the tonic, leading in with iv-V-i in tonic. For the second movement, I will replace that series of chords with something based on the motif of the Scherzo. I don't know if you have listened to the Adagio, but I will consider removing the exposition repeat and the extension of the development. I can use the fugue for a prelude and fugue maybe.
BTW Your profile picture matches your comment so well xD