Nice game!
The 2d character sprites on 3d backgrounds works very well! Good job!
The music arrangement was great too!
I loved all the little references in the shop and the random events. I got to experience a couple of them although I couldn't get the infinite nuggies due to having spent all my coins in the shop before hahaha.
Speaking of shop, it would be really useful to add a tooltip that shows the description or effect of each shop option.
I also spotted some typos here and there but with a quick quality control pass you should be good. Finally, the UI could be polished a bit, but that can be done after the jam.
Definitely looking forward to a more complete version of the game (post-jam) with more playable characters and different environments, as well as some sort of final boss battle and a satisfactory ending sequence. :)
Great work!