I don't know if it was intentional, but the first time I played this, the play button wasn't available, only the shop button (which is hilariously fitting)
I don't want to ruin the secret to beating levels 3 and 4, but I will say once you figure it out . . . it's another thing that's both hilarious and fitting for this kind of game.
Creating a functional and relatively bug-free computer/desktop simulation in flowlab is an awesome achievement, so great job there. The UI and art design fit together cohesively and the hand-drawn style is also really cool.
Lastly, I just wanted to mention that I don't believe I've ever encountered another flowlab game that's made me question whether I actually know the difference between even and odd numbers (nor have found one that makes me so glad I don't have a desk job, haha).
P.S. This better have (paid) DLC after the jam...