Good stuff here's some feedback:
I would scrap the E to deposit the fish, it doesn't feel nice to hold E while using WASD and also it would just be a lot nicer if the fish automatically would go into the barrel if you got close enough
General sense of getting stronger and number going up is good. But I never had this moment where I was like WOW cool upgrade! Try and think of more unique upgrades you could have in the upgrade tree to spice of the gameplay a bit. Drones are quite underwhelming and not very exciting