You cannot rebind controls in this game. The default keyboard controls are so nonsensical that it's not worth even trying to play.
I didn't have huge expectations for Bastard Bonds. I remember seeing a Sseth video a while ago, and the only thing I really remember from that was that it was very gay and gritty. The soundtrack is incredible. That's one of the first things I noticed. The character customization is pretty dang good, although there aren't many hair options and the only beard option looks pretty bad. You can use any 80x64 PNG to replace your character or any other character, and can edit your character's existing sprite too, though. Obviously how feasible that is depends on your sprite art skills. The combat is simple, but it works well and keeps the game moving at a fast pace. I think this game really has the best level-up system of any RPG I've played, although I didn't fully understand it at first. It's very clever. That's one of the bigger flaws of this game. Lots of stuff isn't well explained. You will probably have to look at guides for some stuff (but there are many worse offenders in this area on gog). My biggest frustration is probably in regards to vision and walls. Walls often block your view, even when you've toggled wall transparency on, because they're just a little too far from you. I wish the game just had less walls or shorter walls or something, since they can be a pain. Anyways I really like it. It's an RPG that keeps a very good pace, so as someone who is bored by many RPGs before really getting to the meat, that's a big plus.
