definition of criticism; the expression of disapproval of someone or something based on perceived faults or mistakes.
do you understand that? my opinion IS criticism, so you really make no sense
Yes, I admit, you may be criticising it according to the dictionary definition. But, in every other sense, you are just complaining and whining to anyone who will listen because an indie project made by a single person wasn't to your brilliant standards. Not every free game you play on itch.io by single devs will be a perfect experience. A lot goes into making a game. A lot goes on behind the scenes for the people, too. This complete lack of understanding and empathy is what makes your criticism come across the way it does; it was the reason people got on you in the first place. Reset your expectations. Even if it isn't your cup of tea, someone still made it with love.
If you are going to give out criticism, give something the creator can use to improve. The points about grammar and spelling, for example. Keep subjectivity and objectivity disconnected. The creator would want to improve spelling and grammar, for instance, but if you didn't like the writing style, that is something the creator wouldn't want to change. If they listened to that subjective point, another person would be upset because they liked the old one. You see? Stating preference as a buildable criticism is just confusing. Though all this is working under the assumption that you want to build up the people who make the games you play, which doesn't seem to be the case.
Though I'm rereading what you wrote. It sounds less like criticism and more like a 'Do I recommend this?' Which wouldn't help interested players since most of the negative points about the game are just 'I didn't like it. Not my kinda thing.' twisted into a statement about the objective quality of the game.