Hi, I'm not going to split this guide into sections as it'll be small, and partially this guide is to help me remember stuff but maybe it can help you too (I haven't played to complete yet, I just wanted to explore). If anyone has anything to add just mention it.

CASSETTE LOCATIONS:

YELLOW - BUILDINGS EAST FROM SPAWN [East City]
LIGHT BLUE - SOUTH EAST FROM SPAWN [South Wales, the home of RSG]
LIGHT GREEN - SOUTHWEST [Southwest Forest]
RED - BUILDINGS DIRECTLY AFTER THE GREEN CASETTE AREA. [Forest City]
PINK - NORTH WEST FROM SPAWN [Northwest Sewers]
WHITE - (yet to find though I noticed it was in an image)

COMBAT:

If you fail and get touched by one of the suits, you'll enter a bullet hell section. Simply contain the bullets in your square and make sure they avoid the corners, else the charge resets.

OHR:

I'm not sure entirely about this, but you get zapped if it runs to 0. So pause if you go afk or tab out on the open world map!

$$$:

Kill the guys OUTSIDE of Bullet Hell to get cash (I think damage gets multiplied on each consecutive hit, I might be wrong though). Maybe it'd be a good idea to get about 300 coins at the start. Flaming barrel's seem to be checkpoints and cause enemies to disappear.

SHOP:

PLAS PALM - 250 CR (causes enemies to move faster, and does a faster damage over time on Chi Wave)

DIAMOND DREDGE - 250 CR (slows enemies and does a slow damage over time on Chi Wave)

*can only have one of either Plas Palm or Diamond Dredge, not sure which is best, depends whether there are any enemies you need to kill other than money, but you can easily melee when they are slowed down so I'd go for Diamond Dredge

OHR - 150 CR

EXTRA LIFE - 100 CR (possible maximum of 10 extra lives, every life you use a cow on the map dies)

Cassette - 50 CR

ATTACKS (A):

STANDING: Light kick.

MAX CHI: Chi wave, it's the only ranged option but doesn't do as much damage as the roundhouse kick.

HALF CHI: Roundhouse Kick, does the most damage though you have to be close.

I'm not sure how damage works but attack damage varies, it may be more consecutive attacks = more damage but I'm not sure. Also money seems to be random.