Have you ever been killed by enemies cause you don't have enough health or don't deal enough damage? Well that's probably because you're not earning enough xp. But of course there are ways to earn a lot more xp.

These semi-enemies seem like they're there just to annoy you cause they steal xp, but that's not the truth. As a matter of fact, they're actually vaults. What they do is collect xp and multiplies it, that being said, we don't know how much it multiplies the xp. But what we do know is that it multiplies it more than 1.0x. When killing the gold bug, it drops all of the money it collected.
So when should you kill it? You should kill it while the first boss is active or after the first boss, kill it too early and you barely make any xp.

Upgrading Powerups isn't the best way to get more xp, since you need a lot of Space Cubes in order to make a noticeable difference when getting xp. Upgrading Gold Powerups should be done only after you upgraded the Captain Powerups (You dont have to upgrade all of them).

There are 3 Gold Powerups.
- Gold Find: Get more xp/gold when picking them up (Possibly the best gold upgrade)
- Asteroid Gold: Get more xp/gold from asteroids (A mid upgrade)
- SS Gold Bug Vault: Increases the vault's pickup multiplier (The best gold upgrade)

The powerups you should upgrade are Gold Find and SS Gold Bug Vault. Asteroid Gold is kinda mid, since asteroids don't give a lot of gold to begin with. And also another thing with Space Cubes, there is no point upgrading planets. Maybe you can upgrade their first powerups, but their later powerups are not needed to upgraded.

Enemy Swarms can give you a ton of xp/gold, they're incredibly good in early game. Enemy Swarms as i like to call them, are when ships surround you after a certain amount of waves, the first ones spawning at wave 5.
-Red ships are incredibly weak in terms of defense. They've got low health and spawn mostly in large groups which is why they're so good for earning xp/gold.
-White ships on the other hand are better in terms of defense. They're the stronger versions of the red ships, meaning they're harder to farm for xp/gold, but they still give the same amount as the red ships.

This is one of the least efficient ways of earning xp/gold, Why? First, asteroids drop a little amount of gold. Second, they're pointless after the first boss or second boss. But they are still good at giving xp at very early game.

This is pretty self explanatory, you get xp once you kill the bosses. You don't get a lot xp from them, but atleast you get space cubes so you can use that to upgrade powerups.

This is again, one of the least effective ways to earn xp. Well, atleast when it's not upgraded. If it's fully upgraded, it can make a difference, but it isn't much. You can stay in the planet's zone and get slightly more gold and collect the vault from the refinary it offers once in a while.

This guide will change when more info is available, but since a wiki doesn't exist yet, all info is from playing the game. Comment down below if i missed anything, or made a mistake :)