Interesting prototype! There's something charming about the hand-drawn artwork. The black and white style adds to that "drawn" feel for me.
The game itself is quite hard... I made it past the first boss (i think? it was placeholder art). My heath was a little confusing. It seemed like I would die insanely fast on the waves, but I could last for ages on the boss enemy. Maybe I was missing something that was happening? It was hard to tell if I was hurting the boss until the final phase (the boomerang like attacks). The next wave after that made short work of me.
Probably redundant to mention here, but Norton attempted to assassinate the game. I probably would have let it too, if other commenters hadn't already had this same issue, and confirmed it was fine. Clickteam needs to do something about that!
This is a great start, and with additional development, could be really good! Though at the current difficulty, I don't see myself being able to complete it.