Closets - Nice tune. I could indeed see this fitting well to a game like gunpoint (great game btw). I haven't played heat signature, so maybe I should. The soundtrack provides interest, but it's not too in your face (which helps with thinking and puzzling). Very nice.
Input Delay - Similar as the previous one actually. Not similar in the sense that they sound similar, but they evoke a very similar feeling. One small recommendation though, there's a bit of clicking going on with some of the looping. Noticeable around 57 seconds for instance. It might be nice to smooth those out a little, as they can distract a little bit from that feeling of sinking into the zone. Tiny crossfades or choosing the loop point slightly differently would probably fix this. It's also possible that it just happens to be particularly noticeable on the cans I'm listening on.
Cracked Vision - Ooh, nice chonky bass. I have a bit of an overweight cat, and if I were to represent him as a bass, it would be exactly this bass. Great tune again.
Very enjoyable this OST. Great job! My personal favourite is Closets.