I know it's a super duper stupid question and I know it might ruin the fun, buuut...

any chance this game has cheats? Like, invinvible cheats which helps you living through the hell of mini bosses you always need 5 minutes to reach them from a save point?

The pistol sub weapon you can buy in town is so broken it is like cheating, but I don't recommend it unless very desperate. Ammo refills for it are very expensive and grinding in this game is unpleasant. This leaves you with 6 bullets for the whole game, enough to trivialize a major battle.

6 bullets?! What battle are you suppose to save them for?

@Nirth
I was not thinking of any specific battle when I said that.

You could use Cheat Engine to get unlimited Gold Coins and Health ;)

http://cheatengine.org/
and
http://forum.cheatengine.org/viewtopic.php?p=5403764

Only if you are desperate and willing to spoil the game ;)

There's a miniboss in Dimensional Corridor that gives plenty of money. Before you find a way to kill it permanently, it will keep respawning and you'll be able to afford enough bullets for the entire game easily.

Each fairy has its own star-sparkle animation, and if you leave the area before the animation's done, when you re-enter you can activate the point again. So you can game the system until you get which fairy you want. Just spawn an item fairy (two stars clockwise, two stars counterclockwise) and head to an area that has lots of breakable containers. You can make hundreds of coins in some areas, and quite early in the game as well. Once you get the bracelet it goes even faster.

As for boss fights, just practice a lot, use the pistol, and use Cheat Engine if necessary. I'd recommend against using an infinite trainer, though, just use the normal search to give yourself more health/ammo as needed.

Yep, I found that also giving *a bit* boost to your GOLD or Health with a cheat engine does not always take the fun away. Sometimes it's better than having too much frustration and leave the game...