The fire guy looks really cute!
As JugGames said though, be careful with a lot of particles, on web it tanked the fps by like 20 when a campfire was lit. You could decrease the amount emitted and then either draw a fire animation yourself or use a shader from godotshaders.com to simulate a fire, like this one, for example - https://godotshaders.com/shader/simple-pixelated-fireshader/