I tried to replicate bug and I wasnt able to do so. Basically after lvl5 when I was cheking what can I upgrade I noticed that the basic shield cost 0 to upgrade. After upgrading it a bunch (going through level and doing it again) it was able to do around 53M damage. Im not even sure what happend, maybe some unity shenanigans.
I agree with you that the starting weapons are little to strong, I would you may be able to balance it with better abilities (maybe weapon can deal 200% of damage and boost next weapon -> basic weapon is outclassed), or just scale their damage slower compared to other weapons.
Still though I enjoyed myself, good game. :)
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Yeah, I was caught up in balancing and testing all the weapons with special abilities that I completely forgot about the normal ones lol. I should've spent more time balancing the upgrading system since I kinda glossed over it.
Thanks a lot, I've added this stuff to a list of things to fix after the jam is over.