Just a lot of UI bugs, and shuffling what's in the shop does not actually change what is in there the vast majority of the time. That's not even touching on the significant balance problems. As a demo it doesn't entice me to buy. I'm not even confident it's ready for public sale.
Thanks for the feedback. The demo is more of a playtest and not a sales measure atm. I'm aware that we are not ready for a release yet but I'm sure we'll get there within a few more updates. The shop issue should be fixed with the latest update. The UI and especially the balancing will take a bit more time but I'm sure we'll reach a fun balance eventually. Keep an eye on updates!