Hi, thanks for showing interests in my game! I used Davinci Resolve to make the trailer. It's free to download but it can be pretty confusing if you have no experience in video editing. You could use Shotcut if you want simpler tool. It's also free.
I've been trying to create the video for my game and I had no idea where to start. I'll have a look at Davinci Resolve. Hopefully it will turn out the way I want.