Thank you for your detailed feedback. This prototype/demo was the result of a 3 day game jam. We are continuing development and will be making an announcement soon.
Currently our physics simulation accounts for the weight and size of the discs, so we will have different types of discs in our next release.
We are also doing a lot of work with bounds/hazards/locomotion.
We will be making an official announcement regarding a Steam release soon!!
Thanks again :)