Really great game!
The upgrades make it very interesting, I loved that at the start you choose upgrades that help avid shots and towards the end you need much more firepower :D
I would maybe increase the characters movement speed a bit, at some point it makes the most sense to go in a circle a lot of the time since it's the easiest way to avoid shots.
I love the leaderboard, can I ask how you implemented it? it sounds hard for a two day jam
Overall I had a lot of fun with this game :)