I hesitated for a few weeks before finally trying Hakaiman. Screenshots look terrible, and a top-down stealth action game doesn't really excite me that much, in theory. Controls are a bit complex at first but logical once you get the hang of it, and the text is in Japanese, but that doesn't matter: Press X to change your weapon, Z to throw a grenade or reload your gun, hold Ctrl to strafe, and hit Shift to punch, interact or fire away. There are six levels in total. Nice clean graphics, destructible environments, and excessive violence. Don't let the screenshot put you off.
Get it (1 MB) by clicking here.