ПИСТОЛЕТ – Как легко выжить в ранней игре

First upgrades

As for the first upgrade you realy want that spicy cooldown, if you are able buy at least 2 из них

Second upgrade is going to be pierce. 1 level of pierce is doubling your DPS, 1 is good enough

If you are lucky you can get both of them in first merchant. Chose one of thos upgrades or both if you can and go on

Second merchant

For the second merchant you encounter take another CD

And pierce

If non of present upgrades are there you can also take multishot

Dont get confused by it, it does not increase your bullet count but it spawns projectile that are ghost version of yours when enemy is killed by your bullet. Every level increases number of those projectiles by 1

Third merchant

From not you want to get at least one movement speed upgrade

it helps with squeezing through enemies for coins or you can take

Magnet for better coing pickup range

both of those upgrades are good, but magnet is better for safety, на данный момент

Also its good moment to get 2 или 3 dmg upgrades

Fourth and further merchants

You want to focus on taking more CD to shoot faster

Пирс, for more clear

or if you dont get pierce take

Мультивыстрел; its worse than pierce but it still increases your clear speed

And of course pure damage, cause in order to survive you have to kill enemies quickly

For further merchants just take those upgrades in order like this

CD/DMG > пронзить > CD/DMG > multishot

и с тобой должно быть все в порядке.