Category
Enemies
Every planet has its own family of enemies, but they behave the same way everywhere. Health here is at the start of a run; it grows with the difficulty clock.
| Enemy | Behavior | HP | XP | Gold | First appears | |
|---|---|---|---|---|---|---|
    | Swarm | Fly across the screen in a line, weaving up and down. From difficulty minute 2 they fire single aimed shots. | 2 | 1 | 0.04 | 0:00 |
    | Dart | Dive down the screen in a column, swaying side to side. Each fires one aimed shot on the way down (a fan of 3 later on). | 3 | 1 | 0.06 | 0:00 |
    | Gunner | Drops in, hovers for about 7 seconds firing aimed fans of 3 (5 later on), then flies off. | 12 | 4 | 0.2 | 0:36 |
    | Spinner | Hovers for about 8 seconds spraying a rotating spiral, with 2 arms and 3 later on. | 20 | 5 | 0.3 | 1:24 |
    | Tank | Slow and heavy. Fires rings of bullets and heavy aimed triples, with a line of swarmers right behind it. | 55 | 12 | 2 | 2:24 |
 | Meteor | Mars only. Tumbling rocks from meteor showers. They don't shoot. | 16 | 2 | 1.2 | Showers |
Gold is the average number of coins dropped.
Elites
From 2:24, a gunner, spinner or tank sometimes comes in as an elite: a shimmering gold outline, 4 times the health, 8 times the XP and 4 extra gold. In the final surge they come every few waves.
Enemy bullets
Enemy bullets are always drawn on top of everything else, so you can see them. They come in small pink and big orange. Europa's ice shards and Mercury's embers are bullets too.
