Thanks for playing!
About the lag spike: Yeah, I never had this issue in engine, but I did notice it the first time I played it on itch.io. It's using a GPUParticles2D node so perhaps it's not playing nice with browsers (especially those without hardware accel? I'm unsure). But thanks for letting me know it wasn't just me!
EDIT: Just fixed it by using Godot's built-in particle 2D<->3D conversation feature! It now uses a CPU particle and there is no lag when hitting trash! Sorry about that!