If you're still considering, I've put a couple hours into both games at this point.

I'm really enjoying Haiku. The gameplay is solid and feels similar to hollow knight, though probably not as good yet. I like how the abilities are all flavored around you being a robot, e.g. you unlock wall jumping after installing magnets in your feet. The visual design is also very clear and cohesive, and I personally like the look.

Lone Fungus is decent. It's not very challenging yet, but it seems like they will be incorporating your movement abilities into navigation and combat much more than Haiku. I'm disappointed that so far none of the abilities are related to being a mushroom, you just run and jump around hitting things with a sword.

I'm looking forward to playing through both games as well as Rain World and Blasphemous.