it is NOT Karateka. but i can understand why. As per my usual tradition, heres another screenshot the game! tbh the game has only one map and its a square:Karateka, the HD reboot. (Now in stunning 800x600 graphics!)
Looks like a game called Akane and it's a $5 title on steam with mostly good reviews albeit a seemingly small player base. Like I said before it kinda reminds me of Ruiner.