Thanks for the feedbacks ! Glad you enjoyed it :)
if you want to complete it a t x1 it should take you 1 or 2 days, if you open it from time to time to upgrade your fps.
for the commas & dots : Commas are for fractions (bellow 0) and dots for thousands separations (but I agree it can be confusing and should maybe be made more clear)
The fraction upgrades are here to make buying low value units more interesting the late game but I see how it can be underwelming when you buy them. (it might need to a bit stronger)
Thanks again for the feedbacks :)