Thank you for the feedback!
This game is still a work-in-progress. One of the things that has been implemented (but not yet released) is a complete overhaul in AI pathfinding - enemies get "stuck" inside walls almost never, and they will try to work their way around obstacles to reach you instead of just getting stuck in corners.
Trying to find a good balance of difficulty is tough - each of the ~6 characters in the game play totally differently, but the intent was to always make the Knight character be the 'introductory' character and have him be easier (especially for new players) in the early-game to let people get used to the game and everything - but, he doesn't scale up as strongly so that he ends up being underpowered in the later levels, giving players an opportunity to break out the other characters who might be more powerful or at least have specific strengths for specific challenges... (well that's the INTENT anyway... whether it ends up feeling like that in the end is the hope).
The next update is being worked on. It's turning out to be a lot bigger in scope than previous updates but I will add the other issues to the list to check out.
I hope that you can keep enjoying the game as I keep adding to it and refining things - and can experiment more with different characters/levels/builds.
Thanks again for playing - please tell your friends to check it out, if you want :)