Update 0.0.3

Hello! New update out, and this time I've fixed some major issues. First of all, the max jump height was massive, and there was no way to have a smaller jump after you've upgraded. That's been fixed by allowing you to hold space down longer to jump higher with both floor jumps and air jumps. Next, I've added sliders (temporary method) to show how far you've upgraded your character's various (only three atm) attributes. I've also added an indicator of the cost of each upgrade. Speaking of cost, the cost now increases by 20% each time you buy an upgrade.

Anyway, that's it so let me know if you have any suggestions!