Yes, you can beat it just like all the other versions. It just removes some enemies and obstacles and makes a few enemies easier. The normal version of the game is pretty hard and has a steep learning curve. You will die a lot. However, casual is still challenging and is a valid game mode.
Thank you so much for being a supporter of the project. It has certainly been a learning experience. If you get stuck feel free to join the Stone Crow discord for pointers!
I am aware of this bug and will be patching the game tonight. My apologies there are some bugs specific to casual. I expect to have a new version by the end of the night.