The combat is quite slow and the player can be very easily stun locked if they end up in a bad position. It doesn't help that the player can only take like 2 or 3 hits before going down. 

The gameplay itself is pretty solid despite its issues I said before. The controls on this crystal thing you play as are quite tight and thus it feels challenging without feeling particularly unfair. There is also good placement of checkpoints so it doesn't feel to terrible or inconvenient to loose since you can just jump back in after a few moments of walking. 

I can also say that there isn't a lot of motivation for the player to beat the game story wise. Sure saving humanity is a worthy goal but there is nothing showing the player what humanity is experiencing or why the world is ending other than the vague notion that it simply is. You are a magic crystal automaton fighting things because it has been tasked to you.  Maybe that could be motivation enough without giving the player a text dump at the beginning and end of the game. 

Overall I'd say this game is only fairly entertaining but shows great promise from the developer for future games.