I’d like to plot a square radar chart (not a rhombus) in R. I tried to use the fmsb library, but it appears to be unable to rotate the chart.

#create data
data_t <- as.data.frame(matrix( sample( 2:20 , 4 , replace=T) , ncol=4))
colnames(data_t) <- c("math" , "english" , "biology" , "music")
data_t <- rbind(rep(20,4) , rep(0,4) , data_t)

radarchart(data_t)