No hurry at all - I'm very glad you're taking time to check our suggestions.
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Changing Earl's appearance doesn't stay after reloading the page/game, only after rebirth.
Before rebirth (Witch Doctor Earl iirc)
After rebirth:
Edit: #6F645A is looking good as button color IMO :) the focus is on the fun part: The Arena!
Edit 2: suggestion: implementing x10, x25, x100, x1000 'buying multipliers' at the bottom of the left/skills column (follow the golden arrow!)