Very cool. A couple of criticisms:
- When cloaking the controls become extra floaty, I don't see the point of this, makes sneaking around light sources unviable.
- Sometimes you can kill an alerted enemy right after decloaking, sometimes you can't. This is particularly frustrating on level 18.
- The detection radius of alerted enemies should be shown. It is frustrating not knowing where you will be detected, specially at level 18.
- For some reason the top ghost at level 18 can see you through the crate in the top left side.