Hello!

Given repetitive games I tend to give up after a few hours and either abandon the game or hack it.
Save is @ drive_c/users/user/AppData/Local/HyperParasite/Saved/SaveGames/HPSAVEGAME.sav

NOTE that you have to finish the first area ie. kill the first boss.
Try to have more than 255 money, so that it is easier to find.
Remember the amount.
After you kill the boss, there is a shop, you get a save popup after that.
Save and quit the game.

Make a backup of the save file.

Opening the save file in a hex editor you can find:
MaxHP.....FloatProperty 18bytes
HP.....FloatProperty 18bytes
HostBodyMaxHP.....FloatProperty 18bytes

These three set the HP for the host that you are wearing at the time of the save.
I suggest the guy with the machine gun.
I think melee hosts in this game are only good for cannon fodder, but YMMV.

So, don't change the last 4 bytes from the 18, but the 4 bytes before them.
eg.
00 04 00 00 00 00 00 00 00 00 66 66 BE 41 16 00 00 00

66 66 BE 41 is 23.8 but in game it is 24.
66 66 BE 45 is 6092.8
66 66 BE 46 is 24371.2
You get the idea.
You can find online hex converters that you can use.
These numbers are little endian floats.

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Money is simpler:
Money.....IntProperty 18bytes
Don't change the last 4 bytes from the 18, but the 4 bytes before them.
eg.
00 04 00 00 00 00 00 00 00 00 2D 02 00 00 05 00 00 00

2D 02 00 00 - 557
2D FF 00 00 - 65325
Note that in the last area I found a host that requires 48K money...
You can use the calculator on your OS to convert hex integers.
Note that in the calculator you would write FF2D to get 65325.

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This steam guide is highly recommended.
The game would have been a bit easier, had I read it before...