It's a neat concept for an arcade game. The art and music is pretty cool. The art/UI could use some work though. Both the main menu and the shop screen feel like the emphasis is on everything but the actual buttons, which should be the main focus. I think some clarity is needed. It took me a while to find the buttons on the main menu after all.
For the actual gameplay, it doesn't feel very skill based. Rather how far you get seems to depend entirely on how upgraded you are, which doesn't feel very good. Maybe include either some skill based way to generate money or some basic ability that allows you to do something without using charges of abilities. Also I found that you can push the barrels if you get hit by them when they should probably pass through the player. I imagine this was done to force you to have to jump there to spread out upgrades between jump and shoot, but it just feels kind of weird to have a projectile/damaging thing just hang around.
Great job though, plenty of room to improve and expand on the game!