Creating a fan game as your first project can ease you into game dev, and I hope this will be a start to your future project.
That being said, here are my suggestions:
Having BGM is great for setting your tone, especially since the source material is rather chaotic, but the lack of sound effects made it rather jarring. Also, did you make the BGM yourself?
The game lacking a "grid" hurts the flow of the gameplay since casting ice blocks actively limits your movement, sometimes you can't remove iceblocks after you summoned them at specific spots.
And some issues that need fixing:
The smoothed-out fonts.
The fact you can cheese some levels by removing the top right block.