Great idea and concept! Having the weight come into your decision making is an interesting idea and you should really explore that further. I also recognised the wheel enemies from Dark Souls ? ;)
If I had suggestions, it would be juice, juice, juice!
Add some sound effects for shooting, picking up items, getting hit, etc . Add some particles when an enemy dies, add some screen shake wherever you can! You will see, the difference will be night and day
Congrats on the jam!