I managed to win with all the upgrades and almost 1500 enemies defeated! :D
The game was super fun, I loved the art and effects, especially the enemies being erased with damage and the visualization of the next level when using the grenade.
Still, perhaps there should be a limit on how much the enemy can be erased before dying, because as there are many enemies, sometimes those with low health are almost imperceptible among the others.
Great game, congrats!