Thank you for your constructive criticism! Tunnel is the only map currently, only important thing you might've miss is strength potion, which gives +1 damage permanently. About story, it is going to be unfold later so I'd say your feelings about it is expected, since game can't give you the rest of it currently. About grammar, I wish we could do better, we are not native english speaker so we need someone proofreading for us, which is currently unavailable. I'm glad that it's still somewhat understandable at least. Slowing down tutorial combat is good idea, I think I'll change it on the next update.
Thank you for your feedback, it means so much! We'll try our best to not let you down!