While I totally agree about the shadows, that they would look better if they had a bit of an angle to them, however I won't change them. There are various reasons for that, like me scaling the game up 2x or 3x and because of that the shadows look bad when skewed. Because they're made with code not drawn by hand. The shadows are mostly there to stay how they are, nothing much will change about them.
I tried fixing the toilet shape a bit to make the shadow less straight, and more irregular, I think it looks a bit better now.
And about the characters I've decided that I will actually add a character select, thanks! ^^ I added 2 female characters too, and I think I fixed that white colour you mentioned, eishiya.
Talking about the trees, I actually looked at pictures of stunted and weird looking trees as reference, so it was kind of what I was going for, haha.
But still I felt that you were right that they looked a bit weird, especially the smallest tree, so I made it a bit taller and added more leaves.
I also added some more decorations to the ground as suggested, a few rocks and a flower here and there. I think Im pretty happy with how it looks now, and I should finally start doing other things for the game.
Though I will add some more stuff eventually.