Even though it is more 'Mask' than 'Slick', it is another highlight of this jam.
There are only a handful of rooms, but what is there really really impressive. Everything feels very polished. It has perfect room-chaining ("see all this harmless/hard stuff, just wait when we get back") and it even includes small things like "Star Wars"-swipes, "exploding Lemmings"-particles on death and environmental destruction of the wall and floor. A reminder of how often you failed ;)
The graphics are very clean and at exactly the right resolution-spot between pixelated and sharp. And the adaptive music, which I assumes crossfades between synced tracks and pitches up/down when needed, is both innovative and shines in simplicity.
But the "choose mask" AND "slowdown" mechanic is the real star. Basically you implement the normal controls we've seen hundreds of times but force us to use them indirect by adding a switch step, that is also a whole mechanic by itself. Defeating an enemy uses a mechanic that is opposite of what you use to get to the enemy is really smart. But also gives stressful situation. I like. But being sad.. I don't like ;D
The initial feeling was that the walking speed can be a tad faster or better have a dedicated 'run' button, especially for rooms you've been multiple times. But this addressed by progressions later in the game.
My biggest gripe would be that keyboard controls ain't the way to go, like I said in the chat: "my brain isn't braining the sequence x-shift-down-x-shift-left-x. Kept dying on super obvious bits.." ;) Either have way more built-up rooms to force learning switching or try to look for something that would do the same (like using the cursor keys that implement the shift mechanic at the same time, so you get left hand: WASD+X and right hand: up/down/left/right/space)
What could work in the next playthrough is adding a some mask budget per room, like 4 changes but you still get to choose with ones. And keep decrementing that value each playthrough. So different people will have different solutions, need to be more thoughtful and you mentioned TAS but speed runners really love that stuff.
TL;DR Looks legit like something that storm the steam charts if it was a full game.