Don't let yourself get bullied by these people. Use whatever tools (AI or not) you want and don't get discouraged from doing non-free games with AI.
Most of the people complaining about AI art are using AI at work (or school) themselves.
Thank you for your comment!
I won't get comments like these discourage me, don't worry! :)
I'm currently working on a bigger update for this game, which will come out when the christmas event ends.