I swear this is the last one

Sorry for the mess these past days, but i promise, third time's the charm.

Full changelog

- The introduction level now tells you to press the 'z' button to advance

- Reworked Orb's movement, you no longer fight with your arrow keys to change directions

- Fixed a collision issue in level 3

- Fixed another softlock in level 3

- Fixed a game breaking glitch in level 4's boss

- Rebalanced final boss once again

- Removed junk code lurking in the file