The ambient idea is interesting, minimal but a good starting point to develop further. I would suggest trying to lower the piano velocity in the first track so that it sounds softer, and pay attention to the reverb tails (not sure if you used CC64 for the sustain, but make sure the reverb of one chord doesn’t overlap with the next). The use of the piano in the last track is interesting, turning it into a sort of synth-drone, but I would have used a bit less reverb, or rather: put the reverb in parallel so you have a clean track that combines with one with a lot of reverb. This way, you’ll hear both the ambient effect you want to achieve and have the sensation that the piano is closer to you. I hope these tips are helpful🙂🤞🏼.