This is where I come in and say:
Use @richard’s character animations extension! It allows you to design animations and it will automatically start and stop animations based on certain rules you define. But it doesn’t solve the problem of flipping them. 
But if you post your image by copy and paste it here, I can flip it for you. 
Not related, but I only have to type git for https://github.com/riknoll/character-animations to come up lol.
Also not related, but I made a gist for very useful MakeCode Arcade extensions:
Hopefully, some of the extensions can help or extend your game!