Very cool concept. I think there are not enough games with "pre-programming" mechanics.
I love the graphics and choice of colour. I like that you implemented a menu and a dialogue system / tutorial.
A bug where I couldn't end the pathing "tool" to click on "start" prevented me from going too far into the game. Yet I can see there are many more features that I couldn't explore. I hope you can take some more time for bugfixing and polish in your next game, even if it ends up being simpler mechanics.
I know you opted out of audio, but it's a key element so here's some feedback: the music got annoying after a while. I feels out of place compared to the universe. I love Bach but this game felt like it needed more of a spy-like theme, and maybe a more computerized sound palette. The sound effects would have helped.
Please make a sequel where I can program the cat in lua :P
Keep making games!