Thanks for your wonderful feedback. I am still a beginner game developer, I haven't learned the shop and save/load system yet.
I played your game. Your concept is wonderful. What engine did you use? If you need any kind of illustration work for your game, feel free to contact me.
I'm also a beginner game dev like you. I actually don't use any engine. I just use java with IDE is intelliJ IDEA to work with. If you want, i can share my source code but honestly, it's very awful.