Wuppo

Apart from the bosses, the passage is unlikely to be particularly difficult. For bosses, I recommend stocking up on max HP (see Enlightenment trophy) and purchasing heals (the best ones are the pink ones from the seller in Bliekopolis).
In addition, upgrade your weapons to the maximum from Betty.
The final boss will be the most difficult, where it is advisable to have more healers and a coffee hat with you (it will gradually heal you). To heal calmly, you can wait in the location with two diggers (Blieken) when they have finished barricading the light - the boss will not fly towards them (however, some of his attacks can still get you). The final boss will be the most difficult, every missed blow to the face will be incredibly painful. Don't forget to pick up the small blue orb after "picking up" two Blieken - it will teleport you to the boss and give you invulnerability for a very short time.

To avoid problems with purchasing upgrades and heals, I recommend the following:
- Go to any Ossedeo's shop (the nearest one will be next to Wumhouse, after passing the Tunnel location).
- We buy a white bandana from him ★★☆Fighter Gumgumgun skin for 64 coins.
- We sell this bandana to the same and/or any other seller.
- The bandana does not disappear, but the seller pays for each copy. Can be used on any seller and farm money endlessly.