Very detailed feedback, thank you!
Diagonal Attacks - Further cards will be added with greater range in the future. The good thing is that enemies also rarely have diagonal attacks, which makes planning turns easier as a whole. Definitely planning more characters in the future :).
Input bugs. Thank you! I will search for them.
Pause menu doesn't disable input to gameplay. Fixing this now ;).
Turns. Yes, the harder the enemies, the more turns you get. I'm still not completely sure about this mechanic. Haven't come across going to negative turns yet...will keep my eyes peeled!