I beat this game in less than two hours, and 20 minutes of that was on the first level.
It's a slow, dull beat-em-up where you walk up to a group of thugs, beat them up, regenerate your health, clear an obstacle (door, electric wire) and then rinse and repeat. There seems to be less than half a dozen finisher moves and each one takes a good 15 seconds or so to execute, so you might as well strike the enemy a couple of extra times instead to save yourself some time. Combat is as follows: X, Y, X, Y, X, Y. Oncoming attack? Hit B to dodge. X, Y, X, Y, X, Y. If you want to vary things up, you can try different permutations of X and Y, but it doesn't do much. There are combos you can do by hitting three attacks one after another, which momentarily stuns the enemy, but there's very little difference between them and dodging an attack breaks your combo anyway.
There's no variety in the combat at all. You're constantly fighting the same two kind of enemies, normal and big enemies. They do occasionally have weapons or a shield. You'll be fighting a big thug with a shield in one level, then in the next level a big police officer with a shield. Your moves remain the same throughout the whole game. How about letting me use that baseball bat I disarmed from an enemy? Isn't that beat'em up 101?
Around the second level I got tired of beating up countless groups of enemies, so I tried just walking past them... it worked. In fact, you can walk past about 80% of the enemies in this game. Occasionally there will be a gate you can't climb over until you clear out a group of nearby enemies, but any other type of object (electric box, ladder) you can interact with while in combat.
For some reason Kick-♥♥♥ has a Spanish accent. The voice acting is atrocious. Besides having little to no emotion, almost all of the voice actors mispronounce words (parkour = parker, goth = ghoth). Every other time you climb a ladder, for some reason Kick-♥♥♥ spouts "Damn. Why the hell am I doing this?". You'll be hearing the same taunts over and over throughout the game.
Besides the issues with clipping, invisible walls galore, the camera obstructing your view in combat, and the lack of mouth movement when characters speak, I actually like the graphic style of the game. If they had put a bit of effort into making the combat fun and varied, maybe put some things to do in the levels besides beating up on groups of thugs every 30 seconds, they might have had a decent game.
The game also screws up your system font every time you launch it. Many thanks to the German reviewer here for finding out what the game does: http://steamcommunity.com/id/unevermind/recommended/304170/
The game disables ClearType in Windows. To re-enable it, go to the Control Panel and search for "Adjust ClearType text". Check "Turn on ClearType" and hit next a few times to make your fonts normal again.