I've fixed a few bugs! Here goes.

General
    - Splash screen changed slightly
    - Added temp icon for the exe

Class Select
    - Fixed UI size in windowed mode
    - Changed class colours to make class attributes more clear
    - Increased description text size
    - Slightly changed UI

Upgrade Tree
    - Tooltip position temporary fixes
    - UI changed to be more centered
    - Explains how upgrades work a bit now
    - Back button added

Battles
    - Battle text now scrolls correctly
    - The scrollbar and mousewheel can now be used to scroll the battle text

Items
    - Fixed Ring of Energy to be classed as a ring
    - Fixed Wolfling sprite
    - Swapped some Leg Armour for Necklaces
    - Fixed Emerald Ring's name

Thanks for the bug reports and trying out the game!