Interesting concept. I liked blowing up the walls and sneaking outside the map. I managed to walk all the way around but didn't manage to find any extra secrets :) I had fun romping around.
One minor suggestion is to look into the Godot YSort node so you can make your character walk in front of and behind the flowers. It's a pretty cheap way to add a bit more graphical polish (and check out #help in discord if you run into question).