It's decent, but overall I'd say the game is really mind-numbingly simple and somewhat easy at first, it's mostly just go right and shoot with almost no difference in the gameplay and the level design to spice things up other than for the enemies that spawn.
Even the powerups are lame, they're all just "improve a specific stat". I'm very critical especially because I like the Binding of Isaac and it's got unique items, this game here it's just a net downgrade from that type of gameplay and it feels repetitive to play.
But atleast it's still good enough on its own right.