Thanks for giving my game a try and feedback!
I definitely plan to create less complexity at the start and let it ramp up over time, but taking a complete system and taking the parts out and introducing them in order that not break will take time thus, not be able to do it. I after this game Jam, I actually think that I should create system independently but not whole at a time, then try to take it apart and put into tutorial. (while I might face the problem that later the independent system somehow not work in the whole things, that will be another story)