Cute game :) Everyone else said everything to say. 

Nice job and keep going :)

Nice work! Had a blast playing this! Used the same Tileset in my entry :D

Fun idea and use of the theme. Because more enemies appear over time, I found it more useful to kill my character immediately so the keys could spawn, as that is how you win. I would suggest giving the player an incentive to avoiding your first death because right now, the first life actually hurts the player instead of helping them. Great work though!

Tiago left some great feedback already. The only other thing was that including a way to replay without refreshing the game would be helpful. I died initially thinking I was in a tutorial but I'm really glad I tried it again. The mechanics felt pretty tight once I understood the game and think you did a pretty fun experience. The way the enemies came at you was particularly well done. Although I think you could ramp up the difficulty much more slowly, I loved the early enemy waves especially. 

Great job!

Nice game man. Contraz :) 
I would suggest only three things I think that would improve the game a little.

- Move with WASD keys

- Auto shot. The need to be pressing LMB is a bit tiring in my opinion xD

- Its kinda hard to know where the enemies are.. Maybe adding a arrow around the player pointing where the closest enemy is?

Please play my game and give me your honest feedback :)