Cool game, brings me back to some old Armor Games / Nitrome games.
Unfortunately... the player character is not fun to control. They feel too slow, and there's a period after you land where you're still moving forward but can't jump again, making platforming annoying.
The laser beams will hit the player even if it doesn't actually collide with the character (occurring to me when trying to jump over/away). The mines seems to have inconsistent hitboxes, the open top ones having a larger 'below sprite' hitbox than the covered 'Wall Mines', and if enemies turn around at (I'm assuming) the last frame before you control them they'll kill you.
My big suggestions are to
1. Make running the norm and the run button walks (or increase walk speed but I'm aware that second option would mess with level design)
2. Maybe give guards a brief surprise window where they can't kill you, like how lasers don't get fired immediately.
3. Let me walk off ledges!
All in all, a good proof of concept, and I definitely look forward to the end product (though that might be my soft spot for reverse horror games).