This game is pretty decent, but I think you have to get the correct mindset first to enjoy this game.

If played as a normal action game, this game might be decent, kinda repetitive, but still fun. Combo can get repetitive but it has a nice feeling to it. It also has a bit of simple puzzle to solve. Bosses are good, but not great, most of them are easy and in fact I actually only died once to a boss and that's to a super boss.

If played as a metroidvania (which this game is kinda), then it's pretty bad. The backtracking for item is abysmal, there's no teleport in between area so you have to walk/run back and forth. There's a teleport item which will either takes you to the starting area (of the entire game) or to the last save point, but they cost money.
Not to mention that walking speed feels a bit too slow for how big the map can be.
The cherry on top is that the optional item isn't even that useful or fun most of the time, there's ONE item that I like which is wolf's foot that can make you run and jump faster, and as far as I know, is the only ability that is essential in getting some optional items (apart from straight up key).

To sour the game even more, to use the wolf's foot (and any other RELIC), you need mana, but mana doesn't recover automatically when you go to a save room. You have to either use item or perfectly block an enemy attack (which is almost useless when dodging is a lot easier).
So... I barely use the wolf's foot anyway, or any other relic for that matter.