Pretty cool game! I did encounter 1 issue when I hit the 4th wave, (although I don't think the wave count is related), somehow a gun upgrade was instantly selected for me and immediately the game sent me back to the loadout section, except the gun upgrade was not interactable at all.
Other than this, it played well!
I was really tired when I posted the previous feedback, but essentially I clicked the area of the screen where the text said "click to continue" or similar, and instead of taking me to the weapon drops, I must have instantly selected a weapon through the click to continue text because the sprites showed up for an instant and then immediately I was back in the loadout screen (the one with the shelves where you can drag the weapons onto and off of your wheel)