You should not play this game if you suffer from Epilepsy. But if you can handle flashy screen effects:
Fun visuals, challenging gameplay, fantastic music, and a feast for any masochistic achievement hunter.

There is no better high than finally beating some battle without getting hit after hours of failures.
Biggest criticism would be that the story isn't really worth caring about. For achievement hunters the jump grinding is super tedious and some challenges are annoying to repeat due to a lot of down time before it really starts.

I'm really looking forward to the sequel, though

i'm so glad this is getting a sequel
i love everything about it

It's very sad that many people will only ever see this game as an Undertale wannabe. It's perhaps not an absolute masterpiece, but it is a truly unique experience that deserves way more attention than it gets. The "fights" are definitely the highlights of this game, because of how ridiculously cool and interesting they are.