Thank you so much guys.
This is basically finished but I will take notes for further projects. I know the mixing isn't absolutely top-notch, I try to go with my ears rather than rules.
Yes, the arpeggio at 2:48 was placed that way as I felt like its evoking that "oh, even there's even a sound appearing only two times in a span of two seconds". Kind of wanted this little detail to be there. Maybe it's too upfront but didn't want it to be lost completely, wanted a little stand-out.
The thing at 2:58 is a part of the whole layer, I used some filtering there to expose this thing but I can't remember the process now
The tracks were made in long breaks one after another and a couple things escaped my mind already.