Really like the game idea! A dart RPG essentially. Impressive what you gone done as a solo dev!!
I had some technical issues though. On Firefox the font didn't load at all (I just saw grey boxes in the UI). On Chrome I could see the UI, but the default game window is too small and the UI and gameplay area is not really useable/readble. Finally, fullscreen on Chrome I was able to play normally (although there's a bug where the remaining darts become hidden - possibly after using an item?
Still, it's a creative idea and executed decently well. Could see this becoming a fun full-fledged game. Congrats!