the price is normal, don't worry
there's just nothing to compare with, 2d games usually cost ~ 250p
But there are few games in this genre, so the price should be correspondingly higher
I generally saw "Komatsu Sunshine" for 4990r (of course it is already cheaper, but still)
it's better to think about it later, the game is not done
yet
good luck to you mofu -w-