The game is awesome. As a Pokemon fan - I absolutely love it. More than TemTem, Palworld, Yokai Watch or any other "Pokemon killer"
My personal small nitpick - finding and catching rare Lizzie was harder than defeating Mother Spirit, I started to hate Jellybish for even spawning in the same fishing point and I really desire for Lizzie to spawn somewhere elsewhere in the grass...
Also, objective nitpick - whoever's idea was to sort Spirit's Database not by evolution - is an evil person. I spent a lot of time trying to catch new Spirits in their rare color only to find my already owned Spirits evolve into them. I know National Pokedex sometimes separate Pokemon evolutionary families, but regional Pokedexes are always keep Pokemon from the same family together in the evolution order.
Small suggestion - Spirit's movepool should be larger. Developers created their own typechart, but aside from EV-3 barely any spirit has coverage of the other elements in their 8-9 (only 8-9!) attacks, half of which doesn't do damage! At the endgame my best option was Power Punch on my Polaria, typeless attack with 60 Base Power, because even legendary Valkyrie and Centiboob don't have an attack with more than 55 power (Donkey Punch and Boob Slam). Look at Pokemon - they are usually learn like ~15 moves by leveling up and another ~40 by HM/TM/TR
I hope despite the finale to the main story, this game will keep receiving updates with new zones and new spirits. 75 is a small number, I want more. I know Generation 6 of Pokemon is only 72 species, but Kalos regional dex overall is ~450 (which is crazy too, but Pokemon developers got there over time)