Good fun! I like the simple design, it's easily readable and looks nice!
I found the Roomba spins a bit too fast for me so I was having trouble aiming it properly, I ended up just mashing and hoping it went in the right direction haha.
There's loads of ways this could be expanded, could see it being a really fun concept, stuff like competing in multiplayer, trying to bump eachother away from the dirt and collect it yourself, different stages, roomba designs to choose from, that sort of thing.
Nice, simple concept, good job!