Yeah, ver 0.2 has a lot of bugs at the moment. Sounds, BGM etc will all come in future updates but as I'm working on the game solo, its going to take a long time before its in a polished state.
As for the last question, a fair few of these games are built using the RPG Maker engines. For example, this one is being built in RPG Maker MV. By default, these games include RPG-style stats, health bars etc that help beginner programmers get started with basic battle systems and stats etc.
Games can be customized though so that we can remove or replace all of that, but I haven't got to the stage of customizing the UI yet. That being said, the game will need some stats, so some will remain.
I appreciate any and all bug reports and feedback. Let me know if you find any!