No, do what you want now. Why force yourself to complete the games if you don't enjoy it anymore? People who tell you to "complete the game" just use that as a convenient excuse to hold you hostage and demand free updates. Normal players care about the total amount of content in the game, not whether it's "completed". For a 2$ game on itch, I'd normally expect 1 level and maybe 2 animations. Your game already has 10x that. So it is already 10x completed.
You know I care a lot about HTA. Look at my donations. But if you don't enjoy working on it anymore, then don't. As you said, you could just have marked it "completed" several years ago. Instead, you kept adding new amazing stuff. Every reasonable person has realized this. Only the most ungrateful people haven't. I bought the game in 2021. When I saw you were still adding stuff in 2023-2024, I was already considering it bonus content. But we're in 2025 now, almost 2026. You don't owe your players lifetime updates.