Fork implementing a more direct control scheme:

• Move with arrows keys
• Push with Left Mouse Button
• Pull with Right Mouse Button

World-space SimpleParticles2 and JitterParticles2 share persistent GPU instance streams. Particle birth times keep curve evaluation on the GPU; new births, visibility changes and expired spans update the stream. Ring compaction reuses capacity. Unit, piece and projectile-relative effects retain their original transform path. Lups flushes the shared streams before changing transforms.