Nice and simple but still a lot of fun. I recognise those Kenney assets as I was gonna use the same asset pack.
I like the idea of the power-ups and everything, they fit in well with the increasing chaos of the game. Saying that, the money thing was a bit confusing at first but I understood it.
I would say you should definitely develop this further. It's a nice idea and with a little music, this would be a lot more fun.