I second that the EMMI mechanic is not fun. It's definitely my least favourite part of the game, not enough make me not like it, but it's a constant bad taste in the mouth that keeps coming. But the game itself definitely gets better with more upgrades, even if some of these are clunky. For example the double jump is incredibly clunky, as it only triggers when you're rolling, but that happens inconsistently. I just did a bit where you fight twin soldiers and it was made much much harder because the double jumps don't kick in.
But yeah it's a decent game, not nearly in the same league as Hollow Night or Ori, but I love Metroidvanias, and this is a good one.