More achievement suggestions: Zen: Have a perfect balance of heroic and mutant tangerines when you breach the multiverse. Born to die: Have an expanding infestation of mutant tangerines with no hope of heroic help when you create your first 5D tangerine.
Really fun time waster. Suggestion: Once the lumberjack is fully upgraded maybe just make the final upgrade diamonds? Gold is fairly pointless once you have everything else. Maybe just get rid of the gold counter.