Great job with the smoothness of the animation transitions and feel. Mechanics all work really nicely. The nested level design could almost lean into modern Hitman games and be expanded as far as you like.
Some super fast tweaks I would make to help the player: especially with bold fonts, chop up the text into sections and give some space between sentences, also leave a little more room between the edges of the screen and the text. I'd also have the camera focussed more on the area of play, as in a 2D game when part of a level is running off-screen, the player might assume they are missing something important there. Finally I'd try and condense the keyboard inputs into as few buttons as possible, so the player can pay more attention to the game and get into the flow.
I really enjoyed your game so I hope this doesn't come across as negativity or criticism, you did a fantastic job!