No, I used an asset from 0x72 and Superdark. Follow the links to see these assets. Oh, and I took the interface design from this dude: o-lobster. The rules said that you can use assets. If I understand the rules correctly.
But I developed the game design myself. Just like the code.
I created a trigger by hitting which player activates the spikes. The animation of the spikes includes a hurtbox which is already registered as a damage if a hitbox player is within the hurtbox.