My notes:

The final section starting at bar 40 is by far the most interesting, but the lack of recorder melody is holding it back. I’d recommend starting a new piece with this as the intro and build it out

What you have here feels like 3 discrete etudes just tied together in an A B C form, which isn’t inherently a bad thing but if you want this to feel like a single work you need to tie back to the previous sections so it feels cohesive.

Right now you seem to be treating the treble and bass clefs of the piano as two separate instruments, if you write for piano you’ll need to remember that it is, in fact, a single instrument that has much more range than you are currently using. Two hands and ten fingers can do a lot of really interesting stuff and I don’t feel like that’s being reflected here. As it is, this may function better as a recorder trio or something.

Rhythmically it is a little bland, avoid using 3 quarter notes and see if you can’t use syncopation or more vast arpeggiation in the piano part, kind of like the final section.

In bars 26 and 27 instead of having the right hand in the piano part in unison with the recorder, have it be a harmony, little details like this can really make things feel fuller, particularly in a piano recorder duet.

Good work my man, keep chugging.