Hi Ratmaster, thank you for playing and I am glad you like the idea. Yes the tide looks not too bad considering that I didn't create with the idea or color swapping in mind, I apply the effect after. I instead used the effect to create the bee flying in one of the flower patches.
Probably I will slightly increase the speed of the player but it is slow for a reason. While entering the first building (you can do so clicking a first time the door and a second time once open to get in), the character will have their owns stats and might be faster, stronger and ready for the battle. Mushrooms are usually easy to defeat. During the game there are some hidden power ups and pick up. Some already giving straight benefits, others later.
There's at the moment a way to move in the first building before the mushrooms reach you, you just need to play it around a bit