Out-of-Bounds Techniques

Rope Dart[]

Currently, the rope dart can be used to go OOB. This can involve using the rope dart right before you hit a death trigger, with the iframes allowing you to pass through the trigger. In almost all cases this will cause you to be stuck OOB causing a softlock. However, it can also be used in more useful ways to clip into ceilings.

Hook Clip[]

Alternating Jump/Rope Dart in rhythm can allow you to clip easily through some ceiling

Here's a nice montage of some: video

Wall Jumping[]

A precise wall jumping (near the bottom of the tile) allows you to clip through the ceiling and do some minor/major skips.
You'll not always be able to clip through ceilings since it depends on the placement of the level collisions

1 Tile clip[]

The wall is only 1 tile high.
If the ceiling is more than 1 tile width you can hold against the wall.
Otherwise, you will need to do a backward clip (hold away from the wall while you're in the air and then hold against the wall just before wall jumping)

2 Tiles clip[]

The wall is 2 tiles high or more
The setup is pretty much the same than the 1 tile clips but it can be harder since you must wall jump off the uppermost tile without wall jumping off the lower tiles

Shop Death Abuse[]

This trick is only available once you are able to go at the portal room inside the shop.
In order to do this trick you need to go at the leftmost of the room and do a Hook Clip or a Backward 1 Tile Clip and then duck to die once in the wall.
You'll respawn in the regular level while the game will still think you're in the shop so a lot of content will not be loaded.
Example

Level Clips/OOB[]

Autumn Hills[]

Catacombs[]

Level Skip

Bamboo Creek[]

Howling Grotto[]

Quillshroom Marsh[]

Searing Crags[]

Glacial Peak[]

Small Peak Skips

Tower of Time[]

Elemental Skylands[]

Sunken Shrine[]

[Sun Crest]
Moon Crest
Light Tabi (requires 7 health and dmg reduction)