Move with the mouse, and try to collect the light blue particles. Avoid the spiky-ish enemies. Try to get a highscore or streak!
I didn't expect this to become my most viewed project, let alone surpass 1000 views. This isn't even that good... I guess that's what happens when you put a project in a SDS. If there's a tower defense-ish theme for SDS in about two years, no sooner, I think I'll know what to do. The first enemy will always go directly for the player. This means you can get it to walk through walls. The other enemies will spawn 3 or so seconds apart, and will follow the trail that the previous one has gone. This creates a train of enemies. After the 5th enemy has appeared, no more will arrive.