My review (Forgive my English, I'm a Spanish speaker and I use a translator).
Okay, the game concept is really interesting, as is the gameplay. However, I think it would have worked much better with an arcade style, since the controls allow for it. I'm not really a fan of the decision to use Undertale music, but it's allowed, so I can't say anything.
The controls are smooth, but sometimes laggy. I really like the fact that it has six levels divided into two chapters.
Overall, it's a good game that could be much more refined.
This is my full review (Don't forget to review my game, too).