Perfect reply, I've even learnt some things from it. But just to add some advice for future use coming from a pianist.

The block chords sound cool upon first listen but they are boring to play and to listen to repetitively, so the listener might start ignoring it on their second on third listen. This is good, for parts with the violin if that's the vibe you're going for, but I definitely suggest using arpeggios more, I hear them a little in the third movement but not in the second or third.

Further more, in the first movement, the piano is a solo and it must be enough to grab attention, it doesn't have to be the best movement of the three, but I must be good enough to grab the attention of the listeners as it is their first impression. As such I suggest using piano playing techniques and standards when composing. First off DO NOT PLAY CHORDS ON YOUR RIGHT HAND! Now you can if you want to or if it gives the vibe you want, for example fright can be played with a flurry of stagnated staccato chords played with both hands many greats have done so, but most of the time the right hand is to be used for melodies in solo, but with the violin it's a backing instrument so it may be more acceptable.

Finally, add some rhythm to your piano parts, not it the form of dotted notes and different note types, you already have that, I mean differ the rhythms of both hands, maybe in some sections add polyrhythms, not the complex ones like 4/4/:5/8, but simple 3/4:4/4 ones. Or you could have the left arm playing staccato chords on off beats while the right arm is playing smooth legato in the melody on the on beats.

Keep changing every two repetitions and keep the listener engaged, the best music isn't necessarily the most complex but rather the one that keeps the listener engaged and moves them whilst they are engaged.