Bought this yesterday with some friends on the Steam mid-week madness sale for it. Got into a few games and it feels pretty much like the original. There is some change up of gameplay with giving the characters a "progression" RPG like feel with being able to buy better equipment. My complaints, and those of my friends, are as follows:
1) Mouse and keyboard play is wonky. Your character attacks in the direction the mouse is currently located at on the screen. The problem is that as your team mates run around the screen, the screen position can change even if you don't move the mouse. Which can make targeting a bit of a pain with the mouse.
2) Hard to see you character. In the original game the characters were a bright color and everything else was mostly white, gray, or black. This made picking out the characters easier. In this game with all the fancy graphics and small character, the little strips of color make it harder to figure out your character sometimes in a tough fight. Especially if you noticed you need some food, spot some off to the edge of the screen, and then try to look back and figure out where on the screen you are in order to figure out how to get your character to that food.
3) Balance. The characters are far from equal and the game was designed to be really used in co-op. The elf is very easy to play from the get go and can solo the game from the start without any upgrades to equipment. This is because of the elf's damage output, huge AoE bomb, massive mobility, and being able to do everything from range. The other three characters are not able to do that at all. The Warrior is ridiculously hard to play early on because the warrior is very squishy like all the other classes, but has to always be in the middle of the monsters to do anything. The warrior gets more powerful and much tankier with upgrades, but that takes a lot of dedication to get to that point. The Wizard is fun to use, but needs a meat shield or at least someone else to play a diversion to get his abilities out as most are on long cooldowns. The wizard basically lobs a nuke and waits 3 seconds to lob another. During which the wizard is running around trying not to be killed in 2 hits while waiting to nuke again. The valk is decent from the get go with a mixture of range, mobility, tankiness, and damage output.
Those are the three main problems we found with the game. Didn't get to play too far into it, but I managed several hours of game play last night with it. First time playing a game for that long of a stretch in a long time.