I think your concept would have worked a lot better if you had changed the limitation of your grenades.
Currently I can just spam click the blue grenade and finish all levels. It then feels like a: I point here and character goes here game.
Imagine that the player only had 2 grenades that are on cooldown after being used. This way the player has to use both kinds of grenades equally. And the player is forced to use them more planned because the amount available is limited