Nice work, I like the aesthetic quite a lot, choice of colour and music worked really well.
I wasn't too clear on what was happening but I was able to defeat the plant monster after a bit of wandering around.
I like that the boss felt kinda like a bullet hell enemy where your attacks and aim aren't as important as dodging.
I think having arrow keys for movement and 1 for attacking was a little strange and could use some additional choices like WASD/Spacebar.