Very fun game! I would say there is a concept to improve in here. ;-)
I agree with JoCraft2010, the hammer is just too over powered: I move faster with it so I can just keep spamming it. Using the first weapon is just not an option for me on bigger waves because it is already easy with the hammer too loose some health. I think having a weapon that damage the player is a good idea but it should be more powerful to give the player a choice when shit hits the fan. :’D
I don’t find the weapons super weird: a hammer or shooting projectile to kill enemies are kind of conventional: you could have used anything which does not belong in the scene instead (like… a motorbike handlebar? Don’t ask me where it comes from.).
About the visuals, the main menu and the tile work are great (even when playing from the browser) but the green/orange-ish squares are not really fitting in the scene.
Soundtrack is correctly integrated and I did not experienced any bug with it.