This is quite a polished game for a jam. Classical stealth experience. I feel like the limitation wasn't really incorporated that much. What are the red cubes doing to me? Seems like usual killing.
It's hard to remember to use all the abilities but I got a grasp at it eventually. I like that the levels are procedurally generated (or rather, put in a random order :P). The smoke grenade felt like it was blinding me more then the enemies. Also, some indicator to show when I'll stop camouflaging would be helpful.
The black collectible things are hard to spot (I didn't even notice them before like fourth run). It would be nice to show how many the player has collected. It would feel more like you're progressing.
Unfortunately I haven't finished the game because it was to hard, but I enjoyed it :D