Final boss seemed...bugged. Had one of the small notes first bloat to a massive size and block two spots. Then just disappear. But as far as i could tell it was still there and attacking.
Overall fun little game though.
The duelist type character is really really strong though. As long as you keep upgrading it, to get it maxed ASAP, and run two of them. You always get to one/two-shot before the enemy gets to do anything. Since you don't have anything else to spend money on with them maxed. By just using the screen wide attack, it instantly pays for itself from the kill gold. So it becomes pretty silly at that point, since you have no decision tree. But rather just click that button twice and win.