Help me fix this terrible shower

Hi everyone, I recently bought a property, and the shower is a bit of a nightmare. It’s small and unattractive, and the door is literally a standard door—not something I’ve ever seen before. It also shares the right wall with the bathroom, which you can see in the last picture. I’m not sure if this setup is even up to code. I’m looking for budget-friendly ideas to improve it, but I’m open to spending more if it means a permanent fix. Any suggestions?