Well on one hand it's too easy (just have all your units attack, have as many ranged as possible, and constantly use wall), but on the other hand, I don't have to grind for hours like the previous games.
Lots of fun! Addicting. And you know the developers think of things to make a game enjoyable when they include a pause button (p) when there's already an established way to pause the game (spacebar).
The last level is just dumb. The boss out ranges you on everything, out races you on speed, and easily defeats defensive manuevers and taking a quarter of your health per whack where the whole previous part of the game can be defeated with standing still and doing A-A-S.