Hey there, so I played your game and thought it was pretty nice! The idea fits well with the theme and moving around doesen't feel half bad. The skill tree is super impressive and expansive for just 4 days and probably one of the best aspects of this game so great job on that! Also the enemy variety is very nice for a game made in this short of a time
I do have some points of feedback:
I think the attacks shouldn't be automatic and controlled by the player because it personally felt a bit slow
Super nitpicky but maybe have some sorta feedback when you buy a upgrade just to make them know they bought it, again though it's superr nitpicky and given the time constraints it's totally understandable why it's not there
Other than that I thought it was a solid game so great job :D