I had to do a little google search on ransomware... Here is what I found, from Trend Micro's website:
"Ransomware is a type of malware that prevents or limits users from accessing their system, either by locking the system's screen or by locking the users' files unless a ransom is paid. More modern ransomware families, collectively categorized as crypto-ransomware, encrypt certain file types on infected systems and forces users to pay the ransom through certain online payment methods to get a decrypt key."
First let me say that I would never do anything like this, and that this game is completely safe to download and play. I have an idea as to why ransomware was detected, however. In the game you can earn coins and use those coins to buy items in the shop. I used text documents with different key words written in them to save all the player's coins/items. Since that was the method I used to save all the game data, it would be very easy for anyone to simply open up the text documents and edit the amount of coins/items they have in the game. To solve this problem, I put some of these text documents in a .zip file, and then encrypted it with a password. The zip file is decrypted and opened up whenever the game needs to access the data, and then instantly closed and encrypted again.
From the very small amount of knowledge that I have on ransomware, it seems that doing something like this with .zip files could show up as ransomware on a security software like Trend Micro. This is my best guess as to why something like that would show up, but I can guarantee you that this is safe to download & play and that I would never put malware in any of the games that I make. Once again I'm not an expert, but I hope this helped a little bit. Sorry for the long response, and thanks for your feedback!