You must play the tutorial, there you can know the basic mechanics of the game.
I recommend this guide, where explains a lot of the items.
https://steamproxy.net/sharedfiles/filedetails/?id=2896649808

Weapons of each zone
The weapons or "accesories" are located in the top of those flying platforms that appear sometimes in the map.
For finding one you have to explore the whole area until you find one, there can be 2 for map.
A big help is the "eye" that the creep in the shop sells. When you are in the DreamWIlds (areas) and there are weapons the eye will spin.

At the date of publishing this guide, the game actually have 4 zones
I don't remember them and my head hurts so I won't check them, but there are:

• Fungus zone
  
• Windows xp background zone
  
• Sulfuric acid zone
  
• Pink snow zone

Which differs between zones are the enemies, accesories, area, and THE RING PORTALS

The fungus zone is the easiest zone to play. I recommend getting 75 of Gubbins before going to the castle
Enemies
Anubis eye (weakest), drops 1 Gubbin
Bird fetus (medium), drops 1 Gubbin
Shrek, ogre (hardest), drops 1 Gubbin

Weapons
The weapon that you can find here is the "skull of death", does a lot to damage to your closest enemies and to YOURSELF, so it's BAD, BAD
There's an staff that you can charge it and throw a ball of magic (you can use it as a barrier)

Portals
Pink, it takes you to the Pink Snow zone
Blue, it takes you to Windows XP background zone

This is the best zone for farming Gubbins

Enemies
Turned off computer(weakest), drops 1 Gubbin
TV seal (medium), drops 2 Gubbins
Nautilus tesla (hardest), drops 2 Gubbins

Weapons
The weapon that you can find here is the "hook", which you can be spiderman

Portals
Sewer color portal (I don't know how to describe it but looks ugly), it takes you to the Sulfuric Acid zone.
Blue, it takes you to the Fungus zone

Is the easiest area, due to the lack of obstacles so you can easily find portals or weapons stash.

Enemies
Kamikaze eye (weakest), drops 1 Gubbin
Half life portal dog (medium), drops 2 Gubbins
Flying eye (hardest), drops 2 Gubbins

Weapons
Sorry I can't remember well, but I think that you can find the Skull of Death

Portals
Yellow, it takes you to the Sulfuric Zcid zone
Blue, it takes you to fungus zone

IS THE HARDEST (due the holes and obstacles), THE WORST, but it has a very powerfull item

Enemies
Headless dog (medium, but fast), drops 2 Gubbins
Worm (medium), drops 2 Gubbins
Annoying skull (very strong), drops 2 Gubbins

Weapons
You can find the mighty air compressor, you can take a great impulse and makes the Sulfuric Acid Zone easy
And a fishing rod, you can fish in Windows XP I guess (I haven't tested it)

Portals
Pink, it takes you to the Pink Snow zone
Blue, it takes you to Windows XP background zone

You can progress dying in order to get the tomes.

For beating the game you have to unlock the locks of the "undergound palace orb" (located on the right part of the map) with keys

For getting the keys you can find them in the top of a BIG (REALLY BIG) temple. The temple spawn randomly on a random area, you have to test luck roll between zones for find one, they are hard to miss (really, are very big).

One usefull tip if you want to save Gubbins is going to the Castle and then going back to the zone until a temple spawns.

DISCLAIMER: If you die you have to do that again xd

Once you have the keys, the orb will be unlocked

Underground palace

It has 3 stages

------------------------Pink Desert------------------------
In the first one you have to climp up to the top of a tower.
I recommend using the air compressor fo climbing up more easily.

------------------------First stage boss------------------------
Theres a big whale, I don't know what it's but is bad.
You have to destroy 3 hearts.
Be carefull when the creature screams, when scream It will rush to you and make you 5 points of damage.
For healing you can kill the flying bat that spawns (I don't recommend getting close to the red spiky enemy)

------------------------Final stage boss------------------------
You fight against an imp

I don't have to explain this area, for knowing what will be the next attack look at the hands of the giant enemy and hear the scream.

You can heal with the black eyes that sometimes spawns

When you beat the game, the next time you start you conserve the previous game stats (you can buy the shop items again), be aware that if you exit the game you lose them.

There will be 6 staffs arround the map, you have to click to them in an order

If you're lazzy I will tell you the order.

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Ok
First, the 2 dudes place.
Second, the goth Imp bed.
Third, the shop.
Fourth, the exit orb.
Fifth, the weird old woman pool.

Once you tap them in order you have to go down to the river and there will be a jewell (very scary)

I hope you know what to do now, like, subscribe and have sweet dreams.