Just finished Everhood, which I initially thought was some kind of bootleg Undertale. And it totally was, but not in a bad way.
Similar graphics, tone, themes, and gameplay -- but honestly I had a great time with Everhood. It may have leaned a little hard on its inspiration, but it pulls it off very well.
The game manages to capture the same goofy charms, and present you with fun, hilarious, lovable characters in a world that, while small, feels put-together. It isn't by any means a cheap knockoff.
The battle system is fantastic. Here the game takes the idea
of boss-specific theme songs and runs with it. every
fight (or at least each character) has its own song, and the
battles themselves are super-fun rhythm-based affairs.
This made each battle special, and since lots of character only have a couple lines
it's a kind of way to add more depth to their tiny personalities.
Many of the battles even had special gimmicks that kept things
fresh, and at some points they added new mechanics to make
replaying fights worthwhile (and part of the story).
It didn't have quite the same impact as Undertale, and while it did make me feel things, those things weren't nearly as intense nor as well-defined as what Undertale delivered.
If you enjoyed one you'll likely enjoy the other, and it's well worth the low price and time-investment.