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I think I will implement the increase in difficulty. The levels you see now will be difficulty 1, but level 4 I might reduce the fire guys from a maximum of 5 to 3, then 4 for difficulty 2, then 5 for difficulty 3. Then Difficulty 2 and 3 will be met with faster/more enemies, more barrels, shorter bonus times, etc. Not too much change, but enough to notice an increase.
I don't really have a hi-score because I never tried. Maybe around 35K if I were to estimate. I prefer designing games over playing them
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How is this going? are you still working on this game? I think if you get the difficulty curve right it will be a fully fledged stand alone classic