This has a lot of potential! It's very simple, but also very challenging which is a great combination. I think the switch between the two modes needs to be a touch faster though, because you're expecting precision from the player with the difficult level design but at the same time limiting their ability to perform by having them wait between switches. Maybe halve the switch duration.
The aesthetic is also quite striking, even if it's just three colours. The particles add a lot of style, and you could easily polish this with a little more particle effects and whatnot to make it pop.