Thanks for your feedback.
I expected the sculpting not being intuitive enough. Therefore, I tried to explained in the game description: you should use the primary trigger while holding the sponge in order to put pressure for sculpting.
I mostly expected player to stand up while playing. I thought about the possibility to play seated but I haven't the time to improve the experience this case.
As a child I lived in a place with a lot of cicadas in summer. I try to reproduce the ambiance in my game for the nostalgia :) These insects are even louder than this in practice (much louder than birds which you cannot hear usually ^^).