Look for the original release post. If it says "Pay what you want" or "Free download," you are in the clear. If it says "Buy now," respect the developer.
Start by searching the Official itch.io Store for "maxd04" or "Sakura Sakura." Many developers offer free demos or "Name Your Own Price" versions here. maxd04sakurasakuradathedoggame free
This is almost certainly the of the game's developer. In the world of indie game development, many creators use a consistent online handle on various platforms. If "maxd04" made a game, they likely have or had profiles on game development sites. They are the central figure of your search. Look for the original release post