Pretty fun for a while, interesting concept of constantly swapping between different characters. I felt like the game got a bit repetitive after a while, as it didn't seem to get anymore difficult as time went on even though I could keep upgrading my characters. Also the layout of the hotkeys was a bit awkward, it was difficult to use the dash or special abilities while moving since all the keys were so close together. I think it would feel a lot better if the non-movement keys were placed in such a way that you could easily reach them with your thumb while using your other fingers to move, maybe C, V, B, and the spacebar.
The core gameplay was fun though and it was interesting to consider all the different upgrades. Some audio would have been great though, some nice sound effects and cool music would really heighten the experience I think!