Rogue Legacy is a pretty decent game, though it has some issues that turn it more into a slog. This specifically has to do with character progression.

Every time you enter the castle you must give away a percentage of the money you earned. This means that if you didn't get enough gold for any of the three types of upgrades you lose out. This wouldn't be such a big issue if not for how the progression worked. It's split into three categories. Stat enhancements, armour and magic runes. The game gives you plenty of runes, but surprisingly few armour pieces. These runes are unlocked for each type of armour, but the kinds of runes don't change. Combine this with only being able to equip one rune per piece and you have a system where you'll quickly find a rune setup that you enjoy and will never deviate from. This then makes gathering the rest of the runes feel useless.

With how rare armour pieces are, you'll be stuck with the same set for a while, which means that the only thing to spend money on are the stat upgrades. Which is where the game becomes a grind. You need higher stats to have a chance at getting past the harder zones, which means you have to survive longer so that you can make more gold. One of the most frustrating parts of the game is that it starts to give you small stat upgrades in place of the runes once you've unlocked them all. Which makes it even harder to unlock the already rare armour pieces.

The progression system therefore became something of a slog. Slowly getting enough money to upgrade my stats until I could reach the end. The mechanics are good, but didn't really hold up for the amount of grinding necessary.

Give it a shot if you're bored, but keep in mind that it could be less interesting than you think.