1. First of all, collect currency - magenta coins and triangle rune coins. Now you can use boss rush mode to easily collect rare rune coins.

2. Setup meta for disassembling economics - +2 coins each time you disassemble items and also +1-2 auto heal from coins... Also setup there megashop reroll ability.

3. Most important... Now play normal mode and restart until you get there TRADER perk - fat yellow merchant with bag - which give you also +2 coins on breaking items and 30% discount in Megashop. This is the key to make ultimate dps build. On maps find Z-world minigame which after win give you free blessing - and take another 30% discount. Attention - 3d time you take discount will destroy Megashop, it would still work but... You will see. Also. Second advice (1st was to take trader class). While in game you will encounter many perks. Most important are bullets multipliers by ricochet or new bullet from hit place, etc. Also most important are the perks that give immunity to poison-fire-rad. SO COLLECT ALL TRASH PERKS BY RIGHT MOUSE BUTTON and bring them to the reroller in Megashop room. Unload them to the floor carefully around... And when you press reroll - 1st time costs zero - not only goods on table will change, but also all your trash perks that you collected in game and some of them will convert to very good onces, for example 4-level rarity at the end of game which I'm sure you have never seen... Robot with wide mantis head sending you to Megashop - can be encontered on all maps, also there is consumable (recharging at 5 charges) perk that allow to visit Megashop. Main way to megashop - is to visit it directly on 2nd and 3d green maps, it appears there very often. Prepare gold, perks. If you already have 99 gold - don't collect more, spend in shop and return and collect remainig coins on maps... Also, you can often encounter reroller nearby the big green box before boss fight. Think twice to use it before boss or aftrer boss - with boss relic.

4. Also, I recommend to use third "world" that allow you to put mods on pistols. I mean that big computer in start area with difficulties setup. Also I use "cheaters modifier" nearby the start entrance there - and take "more enemies". You can take there +40 hp, special energy regen, I always take +3 mods ability and +2 lives... All shooting speed multipliers (at the cost of dmg) and additional shots are also musthave. There is one very useful alien item - full autoaim by the cost of 1/2 shooting speed. It's not very useful of you already had built uber build with bullet hell mods and perks.

5. 2secs IDDQD aftrer killling any target. No comments...

6. Figured out how to get 4-th level relic for 100% - it appears when you reroll "alien tech converted to relic". So you can restart game by "C" waiting for special class to appear ("3 alien techs converted to relics but can take only 1") and then get 4-th level at reroll machine in megashop at 2nd level. Megashop are always there at 2-nd and 3-d game levels... Don't use it quick, reroll it for many times, there are good types with fire rate, regeneration, etc...