I can see a lot of effort went into this game, nice job!
I felt confused by what I perceived to be a mismatch with the theme / tone of. If you're going for something slapstick, why invoke Arthurian legend at all? Purely because the thing they're pushing is a table? The disconnect between Welsh legends and modern satirical comedy kind of ruins both of them. The jokes feel cheap, like the joke is that I'm wasting my time playing this game, rather than having anything to do with King Arthur or rolling a table or anything.
The voice actor has a great tone for this game, so good job on that! But maybe talks too much? I found it irksome to listen to him constantly as the game went on, couldn't really follow the story he was trying to tell, which was not helped by the game being tonally and thematically ambiguous. I also found the music too repetitive, and the transition between peace / fighting music was jarring. I really think a mute button / option would improve things.
I think the mechanics of the combat could use some fine tuning. Incessantly swapping knights, without caring about their stats, seems to be an easy way to win any level. I didn't feel like I needed to develop any sort of strategy beyond "heal the hurt one". I do like the art for the knights.
Altogether good job!