Djaron: Greetings

I could read on one of the dev's blog that the game Defender's Quest got an HD remastering... But i dont know if it's a separate product, or an update to existing game...

I already knew they reworked/remade the game engine (or at least that the game changed engine at some point, or had two different working versions). But what about said HD remaster ?

Is the GOG version sold here include/is the HD version or is it a separate update/product non sold here or non included here ?

Thanks