Im having trouble DUE TO THE FACT THE DEMO HAS DISABLED SAVING I MEAN SERIOUSLY
AND THE FIRST BOSS DOESNT EVEN DROP HEALTH NOR IS THERE A HEALTH UPGRADE
also its good 10/10 but for now thumbs down
Sorry to hear you're having trouble finding health upgrades, keep looking! They're there.
And yes, saving is disabled for the demo - because you've got access to the entire game. If you can beat it on one life, in one sitting, you deserve it for free! Good luck.