Does the drawing mechanic feel good?
I thought so! I really liked them. Recognition was pretty damn good when I drew spells, and the book when I hit TAB helped a lot. I LOVE that time slows down while you're casting, but not all the way.
What are problems of that mechanic?
I had a lot of issues aiming projectile spells. Fireball for example starts off fine. I upgraded it and then unlocked the ability to enhance it with another shape, all well and good. The issue after that was my mouse would have drifted a lot, and with little delay before the 3rd targeting window sometimes I could not draw the line to hit my enemy correctly.
While I love the system, maybe just have the ability to click where to attack with projectiles? Keep the line idea for flamethrower? Or maybe allow the player to start the 3rd targeting stroke? Its a bit hard to say because I like it, but It was clunky.
Other then that, fantastic. Had a lot of fun running this. This feels like a lost DS game, and I mean that in a good way.