Very interesting game with a fun concept. The controls could use work, it's very cumbersome to use wasd for movement and shift for dashing, especially when going back to the game after selecting an upgrade. It would be better if you could select upgrades with wasd and take/double with shift, that would make the controls easier as you could keep hands on keyboard, and maybe multiple control schemes at the same time, like arrows and space, to give choice.
Overall very enjoyable, and there may be potential for a full game.