This is actually quite fun. Made it to wave 5 after a couple of tries, and would definitely play this once in a while if there was more variation enemy- and especially level-wise. Nice graphics, fitting music and sound, easy but engaging concept. This has some potential.

That's some serious implementation of the Never Stop Moving theme, with some spicy hack and slash ingredients!

The top-down gameplay is a classic, which also means a solid foundation to build upon, and you succeeded doing it well. Here are some notes that come to my mind while playing:

• I'm not sure if it's just bad luck, but I didn't encounter the shotgun weapon you proposed on the game page. In addition the laser weapon proved to be less effective than the pistol, so I didn't feel the necessity to change weapons. Maybe an ammo limitation would improve on this a little.
• Jumping mechanic is a nice addition. Also the little bar on the bottom left is helpful. There could be something similar for the weapon reload.
• Graphics and music fits well together. On the side of map design, did you consider some more complicated maps? Some variety of the sprites would be refreshing in my opinion.
• Again, maybe it's just me, but... gore is needed for this genre!