I played Melty's Quest the day it came out in English. It's not bad, per se, but it is quite easily one of the most over-hyped H-games of all time, if not the most overhyped. It's short, it's simple, it's generic, it's bland. The game does absolutely nothing out of the ordinary, is plagued with a mix of overly simplistic and needlessly convoluted mechanics, and is just generally really boring.
There are some real gems made using the RPGM engine, but this one just isn't it. It's decent, supremely average, and honestly might be worth a play still, since it has a relatively short length. But there are just so, so many more games out there more deserving of your time.