Is this game worth playing or it is a downgrade as compared to princess/witch trainer?
I'd say check it out and after half an hour you'll know if the gameplay loop is for you.
The game is in essence an intense resource manager. You have to keep track of the season, the day, the weather, and the time of day: all of this will affect which actions are possible and how affective your actions are. You'll also have to take care not to get tired (or even sick) and to keep in shape. You'll learn this only through gameplay, do something, read what the result is...
It's overwhelming at first, but if you get the hang of it, it's entertaining. There is basically no grinding required, because once you managed the mechanics, there are multiple things you should do at any given moment and there's only so much time in a day. You'll be min-maxing a lot.
This gameplay is challenging and it's very possible that you find it tedious. If you try to max one stat, grind for one resource, or blast through a single questline at a time you will not enjoy this. You gotta tackle as much simultaniously as you can, thus your stats and resources are always just good enough proceed. It's hard, but therefor everything can be done in any order and at any time. Still I believe this definitely turns people of.
I also think people have nostalgic lenses about the trainer games. They are really fun - but they are also really tedious. Rummaging through your cupboard and having an occasional hang with Snape, while trying to read a docent books for the first 80 days wasn't really engaging gameplay. Neither was clicking aimlessly on every building in Agrabah, because quests could start and continue at absolutely random location, or within arbitrary dialogue trees, that weren't communicated to the player in any form.
The art direction is another thing that seemingly puts people of. Lot's of Chibi (Akaburs best Chibi so far in my opinion) and not enough CGs - is a common complaint. It's kinda fair. You have to work for the CGs, they aren't as plentiful and as easy to unlock, relative to the gameplay time than in other Akabur games and if that's a deal breaker for you, that's that. Also if oyur really into the hole dressup thing that his other games feature to various extents, it's not really here - I don't care that much about it since I tend to go for the default outfits anytime - but you might.
Akaburs art direction is what it is, the gameplay is his most ambitious, challenging, and in my opinion refined work yet. It's hard now, but it is an actual game instead of a visual novel with slight RPG elements. So that's the tradeoff. What about the writing?
Star Channel 34 is my favourite among Akaburs games. I find it really funny and I like the absurd setting. Still nothing he did so far made me laugh so frequently as the writing of Queen Trainer. It's simply hilarious. But to enjoy that you'll actually have to read the text. If you would rather skip, through a questline till the sexual stuff happens and move on and don't care much about Akamans humor - this is probably not for you.
Hope this helps you make up your mind.
Also if your into the lore - this is essential.
Edit: One more thing I thought of. It's also a farming game. Getting your garden farm, and the broken cart at the market up and running should take priority. It's your best way of making money. The passive income for being Jasmins advisor is marginal and the militia doesn't really pay. Setting this up requires the completion of two seperate side questlines (that are quite long), but it's worth starting it immediately. Never sell your crops to Maslab though, the guy is selling you short, it's way better to stockpile them till your cart is running. The cart can be used to sell your crops at great value - and when your out of crops and don't have the time to grow new ones it still generates a small passive income by selling spices. It's worth it.
The completion of the necessary side quests also provides you with a free source of culture. Culture is what you need to advise Jasmin, and aside from rare random encounters you have to pay for everybit of it.