That is a fresh concept, little bit more development you could have a good game on your hands.
Do you wish to take it further? Maybe if you worked on it some more you could improve the mechanics and release this as a full title.
I had plans for even crazier weapon variety and more randomness for drops and upgrades similar to other twin-stick shooters.
I'll give it more thought on what I can do to improve it. Maybe when the Jam judging is over!