A quick and moderately painless demo, very well polished. Things that bothered me: lack of clarity in what each upgrade does, lack of clarity in what I can pick up vs what I cannot pick up, repetitive sound effects need more variation.
Thank you very much for taking the time and playing the demo, this is some fantastic feedback! Generally I agree, I also taught that it's difficult to know what can be picked up and what some of the powers ups do exactly. For the second one I'm working on a dedicated and detailed stats and build screen and a full power ups tree that'll show what each power progression looks like an what each tier does.
I will try to address most of these issues in the next demo hopefully!