Very lovely game! The story is cute, and I love the fact that you put information about the flowers, I am very fond of these things.
I played twice but wasn't able to get all the flowers because I encountered a few bugs. In my first run, after solving Oliver's second riddle, I wasn't able to talk to him anymore (tho I could see the chatbox in the middle of the screen appear for a fraction of second), the sandbox was still telling me to solve the riddles, but when I went to Grandma's home, Olver's flower was here. After that, I could not find any other flower, I went everywhere, checked everything highlighted and talked to everyone, but nothing, and I ended up being stuck on the map. On second run I got stuck on the map at 4 flowers.
I want all the flowers tho, so I'm gonna go play other games for now but I will definitely come back here! Great job!