SCP Containment Breach is a free game that you can download here. The idea is that you're a participant in the SCP Containment Facility, which holds strange anomalies and entities that threaten "the normality of the world."
The graphics aren't splendid, but they'll do; there are also a couple of minor glitches that you may run in to given that it's in a pretty early build. The voice-acting however is pretty good.
There are some interesting mechanics at play, as you can see above. Plus bonus Day9 corgi costume.
SCP Containment Breach can be downloaded for free at the link above.