Nice midi music, aesthetic is great. That, along with dragging and bringing certain windows to the front encapsulates the old feel for sure. The bonzi buddy clone is funny. Really, all it needs is menu and more microgames, and I'm sure you know that, so I guess I'll give my own idea for player experience in regards to pacing:
Every 100 or so there should be an intermission where everything pauses and you focus on 1 boss window that takes 15-20 seconds to beat. When you win or lose that, everything continues where it left off. This way it feels like chunks of a gauntlet and you can introduce new microgames after each chunk and the boss can give you 1 life back for winning it.
Have at that idea if you wish. Anyways, I can't wait to see more!