Fun quick game, but hard as hell. Fkeys and characters was really hard for me, I think even without the categories it would have been a challange. I'm also not exactly sure how the categories work, I think the mails also vanished if not the correct category was chosen.
I think exporting to web would give you much more players, currently most games without many reviews are downloadable binaries whereas nearly all games with a high amount of reviews are directly playable. Also it should be very easy with godot.
(first posted this comment directly on your game page, but I think here it's more appropriate. Sorry for the spam!)